Question

Three numbers form a g.p.if the first and third numbers are 5and245 respectively,find two possible values for the middle number.

Answer 1

A geometric progression is when you have a common ratio. In order for 3 numbers (5, x and 245) to be a geometric progression they should have a common ratio. In order to solve the 2nd number the common ration should be establish; (x/5) =(245/x) solving for x, the middle number is either 35 or -35.