The fourth proportional to 0.12, 0.21, 8 is:

The fourth proportional to 0.12, 0.21, 8 is:
[A]8.9
[B]14
[C]17
[D]56

14
Let the fourth proportional be x. Then,
\frac{0.12}{0.21} = \frac{8}{x}
=> x = 8\times \frac{0.21}{0.12}
=> x = 8\times \frac{21}{12}
=> x = 14
Hence option [B] is the right answer.

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