Question : Find the fourth proportion to 21, 49, and 18.
Option 1: 42
Option 2: 56
Option 3: 49
Option 4: 44
Answer (1)
23rd Jan, 2024
Correct Answer: 42
Solution :
Given numbers, 21, 49, and 18.
Let the fourth proportion be $x$
⇒ 21 :: 49 = 18 :: $x$
⇒ $\frac{21}{49}=\frac{18}{x}$
⇒ $x=\frac{18\times49}{21}$
⇒ $x=42$
Hence, the correct answer is 42.
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