Question : The third proportion of 1.8 and 9 is:
Option 1: 7.5
Option 2: 35
Option 3: 81
Option 4: 45
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Correct Answer: 45
Solution :
Let the third proportional be $x$.
By the definition of third proportional:
$1.8:9::9:x$
⇒ $\frac{1.8}{9}::\frac{9}{x}$
⇒ $x=\frac{81}{1.8}$
⇒ $x=45$
Hence, the correct answer is 45.
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