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,
$latex \frac{0.12}{0.21} = \frac{8}{x}&s=1$
$latex => x = 8\times \frac{0.21}{0.12}&s=1$
$latex => x = 8\times \frac{21}{12}&s=1$
$latex => x = 14$
Hence option [B] is the right answer.