Question : Find the third proportional to 8 and 20.
Option 1: 25
Option 2: 50
Option 3: 40
Option 4: 64
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Correct Answer: 50
Solution : Third proportional to $a$ and $b$ is given by $\frac{b^2}{a}$, where $a$ = 8, $b$ = 20. So, the third proportional to 8 and 20 is = $\frac{20^2}{8}$ = $\frac{400}{8}$ = $50$ Hence, the correct answer is 50.
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