Question : The fourth proportional to 8, 32, and 13 is:
Option 1: 39
Option 2: 40
Option 3: 26
Option 4: 52
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Correct Answer: 52
Solution : Let the fourth proportional to 8, 32, and 13 be $x$. ⇒ $8:32:: 13:x$ ⇒ $\frac{8}{32} = \frac{13}{x}$ ⇒ $x = 13\times 4$ $\therefore x = 52$ Hence, the correct answer is 52.
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