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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Answer (1)
17th Jan, 2024
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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