Question : Find the fourth proportion for 15, 55, and 81.
Option 1: 231
Option 2: 297
Option 3: 335
Option 4: 313
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Correct Answer: 297
Solution : Assuming the fourth proportion is $x$. 15 : 55 :: 81 : $x$ ⇒ $\frac{15}{55}$ = $\frac{81}{x}$ ⇒ $x$ = $\frac{81×55}{15}$ ⇒ $x$ = 297 Hence, the correct answer is 297.
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Question : Find the fourth proportion of the numbers $\frac{1}{3}{rd}$ of 15, $\frac{4}{5}{th}$ of 25, $\frac{3}{7}{th}$ of 35:
Option 1: 65
Option 2: 55
Option 3: 60
Option 4: 50
Question : The fourth proportion of numbers 8, 20 and 15 is:
Option 1: 37.5
Option 2: 10
Option 3: 10.6
Option 4: 200
Question : Find the fourth proportion to 0.24, 0.6, and 20.
Option 1: 50
Option 2: 24
Option 3: 54
Option 4: 48
Question : The third proportion of 1.8 and 9 is:
Option 1: 7.5
Option 2: 35
Option 3: 81
Option 4: 45
Question : The fourth proportion of 1.4, 8.4, and 4.2 is:
Option 1: 2.8
Option 2: 0.7
Option 3: 25.2
Option 4: 6.4
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