Question

The first third and fourth terms of a proportion are 3,12 and 36 the second term is?

Answer 1

3 : x :: 12 : 36

 \(\frac{3}{x}\) = \(\frac{12}{36}\)

\(x \times 12 = 3 \times 36\)

\(x = \frac{3 \times 36}{12}\) = 9

The second term is 9.