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Ratio and Proportion - General Aptitude

Q1:

The fourth proportional to 5, 8, 15 is:

A 18

B 24

C 19

D 20

ANS:B - 24

Let the fourth proportional to 5, 8, 15 be x. Then, 5 : 8 : 15 : x 5x = (8 x 15)

x = (8 x 15) = 24.
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