Question : Find the fourth proportion to 0.24, 0.6, and 20.
Option 1: 50
Option 2: 24
Option 3: 54
Option 4: 48
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Correct Answer: 50
Solution :
Assuming the fourth proportion is $x$.
$0.24:0.6: : 20:x$
⇒ $\frac{0.24}{0.6}$ = $\frac{20}{x}$
⇒ $x$ = $\frac{20×0.6}{0.24}$
⇒ $x$ = 50
Hence, the correct answer is 50.
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