Question

The third proportional to 4&9 is

Answer 1

Answer:

$let \: the \: third \: proportional \: be \: x \\ 4 : x: 9 \\ it \: can \: be \: written \: as \\ 4 : x : : x : 9 \\ \frac{4}{x} = \frac{x}{9 } \\ by \: cros \: multiplication \\ 4 \times 9 = x \times x \\ x { }^{2} = 36 = {6}^{2} \\ x = 6$