Find the ratio of mean proportion of 4 a

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Target Exam

CUET

Subject

General Test

Chapter

Numerical Ability

Topic

Ratios

Question:

Find the ratio of mean proportion of 4 and 16 to the 4th proportion of 4, 5 and 20 .

Options:

8 : 9

7 : 6

5 : 4

8 : 25

Correct Answer:

8 : 25

Explanation:

Mean proportion ⇒ $\sqrt{4×16}=\sqrt{64}$ = 8

Fourth proportion(x) ⇒ $\frac{4 }{5}$ = $\frac{20 }{x}$ ⇒ x = 25

Req. Ratio = 8 : 25