The fourth proportional to 5, 8, 15 is:

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Question: The fourth proportional to 5, 8, 15 is:

[A].

18

[B].

24

[C].

19

[D].

20

Answer: Option B

Explanation:

Let the fourth proportional to 5, 8, 15 be x.

Then, 5 : 8 : 15 : x

5x = (8 x 15)

x = (8 x 15) = 24.
5