Question : Find the fourth proportional to 0.48, 0.84, and 32.
Option 1: 65
Option 2: 34
Option 3: 56
Option 4: 43
Correct Answer: 56
Solution :
Let the fourth proportion be $d$.
$0.48: 0.84=32: d$
⇒ $\frac{0.48}{0.84}=\frac{32}{d}$
⇒ $\frac{4}{7}=\frac{32}{d}$
⇒ $d=7\times8$
$\therefore d=56$
Hence, the correct answer is 56.
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