solve for x in the following proportion 3/5=x/25?

x = 15.

15

3/5 = x/25
3 = 5(x/25)
3 = x/5
x = 3(5)
x = 15

75 / 5 = x
x = 15

3 x 5 = 15
5 x 5 = 25

Your final answer is 15/25. For further usage, the technique is called cross multiplcation.

it is definitely 15

In fractions you need to cross multiply. For this one you multiply 3 x 25 and then divide by 5. You answer for x is 15.

3/5=x/25

(3)25=5x

75=5x

15=x

15

15?

3/5*25 = x
x = 15

which ever math operation is on one side of the eqn, it's the opposite operation on the other side. (- --> +, + --> -) (* --> / , / --> *)

For example

x+3 = 5 --> x = 5-3
x-3 = 5 --> x = 5+3
x*4 = 5 --> x = 5/4
x/4 = 5 --> x = 5*4