Find the ratio of mean proportion of 9 a

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Target Exam

CUET

Subject

General Test

Chapter

Numerical Ability

Topic

Ratios

Question:

Find the ratio of mean proportion of 9 and 49 to the 4th proportion of 3, 5 and 9.

Options:

5 : 2

4 : 3

7 : 5

8 : 9

Correct Answer:

7 : 5

Explanation:

Mean proportion ⇒ \(\sqrt{9×49}=\sqrt{441}\) = 21

Fourth proportion(x) ⇒ \(\frac{3 }{5}\) = \(\frac{9 }{x}\) ⇒ x = 15

Req. Ratio = 21 : 15 = 7 : 5