If the fourth proportional to 5, 15, and 25 is k, then find k.
k = 75
The fourth proportional to \(a, b, c\) is \(d\) such that \(a:b = c:d\), that is, \(d = \frac{b \times c}{a}\).
Here, \(a=5, b=15, c=25\), so \(k = \frac{15 \times 25}{5} = \frac{375}{5} = 75\).
Hence, the fourth proportional k is 75.
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Important Questions from Fourth Proportional
If p is the third proportional to 8, 20 and q is the fourth proportional to 3, 5, 24, then find the value of (2p + q).
Find the ratio between the fourth proportional of 12, 16, 6 and the third proportional of 4, 6.
The fourth proportion to 12, 18, 6 is equal to the third proportion to 4, k. What is the value of k?
What is the ratio of the fourth proportional of 2, 5, 6 and the fourth proportional of 6, 8, 9?
The fourth proportion to 12, 24 and 27 is the same as the third proportion to A and 36. What is the value of A?
