Question : The fourth proportional to 0.3, 0.8 and 0.108 is:
Option 1: 0.144
Option 2: 0.124
Option 3: 0.288
Option 4: 0.482
Correct Answer: 0.288
Solution : Given: The numbers = 0.3, 0.8 and 0.108 Let the fourth proportion be $x$. We know that, If $a ∶ b = c ∶ d$; then $d$ is called the fourth proportional to $a, b,$ and $c$ ⇒ $\frac{a}{b}=\frac{c}{d}$ ⇒ $\frac{0.3}{0.8}=\frac{0.108}{x}$ ⇒ $x=\frac{0.108\times0.8}{0.3}$ ⇒ $x=\frac{0.108\times0.8}{0.3}$ = 0.288 Hence, the correct answer is 0.288.
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Question : The mean proportional of 0.04 and 0.36 is:
Option 2: 1.2
Option 3: 12
Option 4: 0.12
Question : The value of $x$ in the following equation is: 0.3 + 0.6 + 0.7 + 0.8 = $x$
Option 1: $5.3$
Option 2: $2\frac{3}{10}$
Option 3: $2\frac{2}{5}$
Option 4: $2.35$
Question : Find the fourth proportional to 0.48, 0.84, and 32.
Option 1: 65
Option 2: 34
Option 3: 56
Option 4: 43
Question : The ratio of the third proportional to 16 & 40 and the mean proportional between 10 & 40 is:
Option 1: 5 : 1
Option 2: 1 : 5
Option 3: 4 : 1
Option 4: 1 : 4
Question : Find the fourth proportional of 22, 66 and 11.
Option 1: 23
Option 2: 33
Option 3: 17
Option 4: 39
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