Question

the first three terms of a proportimal are 15,25and30. find the fourth proportimal.​

Answer 1

Answer:

$15 : 25 : : 30 : x \\ 15 : 25 = 30 : x \\ \frac{15}{25} = \frac{30}{x} \\ 15x = 30 \times 25 \\ x = \frac{_{2 \: \: } \cancel{ 30} \times 25}{ \cancel{ 15} _{ \: \: 1} } \\ x = \underline{ \underline{ 50}}$