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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