Question : Find the fourth proportional to 0.48, 0.84, and 32.
Option 1: 65
Option 2: 34
Option 3: 56
Option 4: 43
Correct Answer: 56
Solution : Let the fourth proportion be $d$. $0.48: 0.84=32: d$ ⇒ $\frac{0.48}{0.84}=\frac{32}{d}$ ⇒ $\frac{4}{7}=\frac{32}{d}$ ⇒ $d=7\times8$ $\therefore d=56$ Hence, the correct answer is 56.
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Question : Find the mean proportional between 32 and 162.
Option 1: 99
Option 2: 65
Option 3: 72
Option 4: 97
Question : Find the fourth proportional of 22, 66 and 11.
Option 1: 23
Option 2: 33
Option 3: 17
Option 4: 39
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 32, 32, 32, 34, ?, 106, 530
Option 1: 96
Option 2: 38
Option 3: 102
Option 4: 34
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
Question : Find the third proportional to 16 and 20.
Option 1: 25
Option 2: 23
Option 3: 24
Option 4: 26
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