Question : What is the fourth proportional to 189, 273, and 153?
Option 1: 117
Option 2: 299
Option 3: 221
Option 4: 187
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Correct Answer: 221
Solution : Let the fourth proportional be $a$. According to the question, ⇒ $189:273=153:a$ ⇒ $a=\frac{273×153}{189}$ ⇒ $a=221$ Hence, the correct answer is 221.
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