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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