Question : The third proportion to 25 and 35 is:
Option 1: 35
Option 2: 49
Option 3: 40
Option 4: 25
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Correct Answer: 49
Solution : Let $x$ be the third proportional to 25 and 35. Then $25 : 35:: 35: x$ ⇒ $25\times x=35\times35$ [Product of extremes] ⇒ $x=\frac{35\times35}{25}=7\times7=49$ Hence, the correct answer is 49.
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