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The fourth proportional to 5, 8, 15 is:
Answer & Solution
Correct Answer:
Option
B
$$\eqalign{
& {\text{Let}}\,{\text{the}}\,{\text{fourth}}\,{\text{proportional}}\,{\text{to}}\,5,\,8,\,15\,{\text{be}}\,x \cr
& {\text{Then}},\,5:8:15:x \cr
& \Rightarrow 5x = {8 \times 15} \cr
& x = \frac{{ {8 \times 15} }}{5} = 24 \cr} $$
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