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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