Find the fourth proportional to 2.5, 4, and 10.
16
Four quantities a, b, c and d are said to be in proportion, with d as the fourth proportional, if a/b = c/d.
Here a = 2.5, b = 4 and c = 10, so 2.5/4 = 10/d.
Cross-multiplying gives 2.5 x d = 4 x 10 = 40, so d = 40 / 2.5 = 16.
Hence, the fourth proportional to 2.5, 4 and 10 is 16.
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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:
