Find the fourth proportional to the numbers 8, 32 and 17.
68
If a, b, c, d are in proportion, then \(\dfrac{a}{b} = \dfrac{c}{d}\), which gives \(d = \dfrac{b \times c}{a}\).
Here a = 8, b = 32, c = 17, so \(d = \dfrac{32 \times 17}{8}\).
\(d = 4 \times 17 = 68\).
Hence, the fourth proportional is 68.
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Important Questions from Fourth Proportional
The fourth proportional to the numbers 5, 6 and 8 is:
What is the fourth proportional to the numbers 50, 35 and 20?
If 162 ∶ x ∶∶ x ∶ 338, find the positive value of x.
The fourth proportional of 10, 15 and 30 is:
The fourth proportional to 3, 12, 14 is:
