The fourth proportional to 0.12, 0.21, 8 is:
Q. The fourth proportional to 0.12, 0.21, 8 is:
Answer: 14
Notes: 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.