Question : What is the third proportional number to 10 and 20?
Option 1: 30
Option 2: 25
Option 3: 50
Option 4: 40
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Correct Answer: 40
Solution : Let the third proportional be $x$. So, $a:b::b:x$ ⇒ $10:20::20:x$ ⇒ $\frac{10}{20}=\frac{20}{x}$ ⇒ $x=\frac{400}{10}$ = 40 Hence, the correct answer is 40.
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