Find the mean proportional between 4 and 66. MCQ with Answer and Explanation

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Find the mean proportional between 4 and 66.

A. 70

B. 32

C. 19

D. 16

Answer: Option D

Solution (By JKSSB Mock Tests)

Mean proportional = √(4 × 66) = √(264) = 16.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 34 and 17.

A. 27

B. 51

C. 24

D. 48

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Correct Answer: Option C

Explanation:
Mean proportional = √(34 × 17) = √(578) = 24.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 4:6. After 10 years, the ratio becomes 7:8. Present age of A is?

A. 32 years

B. 64 years

C. 37 years

D. 26 years

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Correct Answer: Option A

Explanation:
Let ages 4k and 6k. Then (4k + 10)/(6k + 10) = 7/8. Solving gives k ≈ 8, age of A = 4*8 = 32.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 16 and 39.

A. 27

B. 24

C. 55

D. 48

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Correct Answer: Option B

Explanation:
Mean proportional = √(16 × 39) = √(624) = 24.

This question belongs to: Maths Ratio and Proportion

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