Fourth Proportional

Fourth Proportional

Fourth term in a proportion with four terms.

In the proportion with four terms \(\dfrac {a}{b} =\dfrac {c} {d}\), the term d is the fourth proportional.


\(\dfrac {5}{8} =\dfrac {25} {x}\)

By calculating, we find that the 4th proportional, which is the value of the unknown x, is 40.

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