Question : Find the fourth proportion to 21, 49, and 18.
Option 1: 42
Option 2: 56
Option 3: 49
Option 4: 44
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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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