Find the mean proportional between 15 and 43. MCQ with Answer and Explanation

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Find the mean proportional between 15 and 43.

A. 28

B. 58

C. 50

D. 25

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(15 × 43) = √(645) = 25.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 5:4 and b:c = 4:6, then a:b:c = ?

A. 10:8:12

B. 5:4:6

C. 5:5:6

D. 4:4:7

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:4, b:c = 4:6 ⇒ a:b:c = 5:4:6.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 7:4. After 7 years, the ratio becomes 10:5. Present age of A is?

A. 168 years

B. 89 years

C. 78 years

D. 84 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 4k. Then (7k + 7)/(4k + 7) = 10/5. Solving gives k ≈ 12, age of A = 7*12 = 84.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 6:9 and b:c = 9:11, then a:b:c = ?

A. 6:9:11

B. 6:10:11

C. 12:18:22

D. 5:9:12

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:11 ⇒ a:b:c = 6:9:11.

This question belongs to: Maths Ratio and Proportion

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