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Question
The fourth proportional to 5, 8, 15 is:
Options:
A .  18
B .  24
C .  19
D .  20
E .  21
Answer: Option B


Let the fourth proportional to 5, 8, 15 be x.Then, 5:8 :: 15:xx = (8 * 15)/5 = 24.



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