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Find the fourth proportional to 3, 5 and 15.
Question

Find the fourth proportional to 3, 5 and 15.

A.

25

B.

20

C.

35

D.

15

Correct option is A

Given;

3:5::15:?

Solution:

let the fourth proportional =x

35=15x\frac{3}{5}=\frac{15}{x}

x=75\3

x=25

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