Question : Find the fourth proportional of 144, 192, and 216.
Option 1: 361
Option 2: 288
Option 3: 324
Option 4: 289
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Correct Answer: 288
Solution : Let the fourth proportional be $x$. For the fourth proportional of 144, 192, and 216, $144 : 192 :: 216 : x$ ⇒ $\frac{144}{192}=\frac{216}{x}$ ⇒ $x=288$ Hence, the correct answer is 288.
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