Question : Find the third proportional of 25 and 45.
Option 1: 85
Option 2: 65
Option 3: 81
Option 4: 76
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Correct Answer: 81
Solution : Let the third proportional to the two numbers 25 and 45 be $x$. So, 25 : 45 :: 45 : $x$ $⇒x = \frac{45\times 45}{25}$ $\therefore x=81$ Hence, the correct answer is 81.
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