Find the mean proportional between 36 and 21. MCQ with Answer and Explanation

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Find the mean proportional between 36 and 21.

A. 54

B. 30

C. 57

D. 27

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(36 × 21) = √(756) = 27.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 7:4 and b:c = 4:4, then a:b:c = ?

A. 7:4:4

B. 7:5:4

C. 14:8:8

D. 6:4:5

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 7:4, b:c = 4:4 ⇒ a:b:c = 7:4:4.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 10:13 and their sum is 454. Find the numbers.

A. 190 and 247

B. 204 and 226

C. 380 and 494

D. 174 and 258

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Correct Answer: Option A

Explanation:
Numbers = 10k and 13k. 10k + 13k = 454 ⇒ k = 19. Thus, numbers are 190 and 247.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 5:8. After 6 years, the ratio becomes 6:11. Present age of A is?

A. 74 years

B. 80 years

C. 160 years

D. 85 years

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Correct Answer: Option B

Explanation:
Let ages 5k and 8k. Then (5k + 6)/(8k + 6) = 6/11. Solving gives k ≈ 16, age of A = 5*16 = 80.

This question belongs to: Maths Ratio and Proportion

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