Quantitative Aptitude Ques 2071

Question: The fourth proportional to 5, 8, 15 is [Canara Bank (PO) 2011]

Options:

A) 18

B) 24

C) 19

D) 20

E) 21

Show Answer

Answer:

Correct Answer: B

Solution:

  • Let the fourth proportional be x. Then, $ 5:8::15:x $

$ \Rightarrow $ $ 5\times x=15\times 8 $ $ \because $ Product of extremes = Product of means

$ \Rightarrow $ $ x=\frac{120}{5} $
$ \Rightarrow $ $ x=24 $

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