Mean Proportional – Verified PYQ Authority Guide
Mean Proportional is treated here as a focused concept hub. The aim is to show exactly how this concept appears across verified PYQs, which formulas or relationships recur in the solved corpus, and which nearby concepts deserve revision next. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.
PYQ evidence snapshot
13 verified PYQs are currently mapped to this Concept hub. The represented years include 2025. Exam coverage currently includes RRB NTPC Under Graduate Level. Subject context includes Quantitative Aptitude. These values come from live mappings and can expand automatically when new verified PYQs are added.
Most useful verified PYQs to solve first
Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.
- Of three numbers, the first number is 25 and the third number is 100. If the second number is the mean proportional between the first and the third numbers, find the value…
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches 50. - What is the mean proportional between 0.16 and 0.49?
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches 0.28. - The mean proportional of 0.15 and 0.000135 is ______.
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches 0.0045. - If the mean proportional between x and 36 is 12, find x.
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches 4. - The sides of two square gardens are 16 m and 25 m, respectively. A third square garden is to be constructed such that the length of its side is the mean proportional…
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches 20 m. - Find the mean proportional between (x + y)² and (x - y)², (x and y are natural number and x > y).
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches x2– y2. - What is the mean proportional between 0.0009 and 0.25?
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches 0.015. - Two positive numbers differ by 20. The mean proportional between these two numbers is 24. What is the sum of these two numbers?
RRB NTPC Under Graduate Level · 2025
Use the standard Mean Proportional method and simplify; the result matches 52.
Formula & key-relationship bank from verified solutions
a : b = c : d ⇒ ad = bc
Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.
Core ideas repeatedly reinforced by the solved corpus
- Use the standard Mean Proportional method and simplify; the result matches 50.
- Use the standard Mean Proportional method and simplify; the result matches 0.28.
- Use the standard Mean Proportional method and simplify; the result matches 0.0045.
- Use the standard Mean Proportional method and simplify; the result matches 4.
- Use the standard Mean Proportional method and simplify; the result matches 20 m.
Exam tips already validated in SRO solutions
- Identify the Mean Proportional relationship before calculation and keep units/bases consistent.
Common mistakes to avoid
- Using a shortcut without checking its conditions or using the wrong base/unit.
Topic and concept coverage
Mapped topic labels include Ratio and Proportion. The concept trail includes Mean Proportional. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.
Knowledge Graph navigation
Continue with Proportion, Ratio and Proportion, Arithmetic, Quantitative Aptitude. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.
How to revise this authority page efficiently
- Solve before reading: answer a mapped PYQ first.
- Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
- Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
- Reattempt: solve another verified PYQ from this hub and check whether the same error repeats.
Quality scope: this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.