Question

Solve the proportion to determine the value of x. 2x / 5 = x+3 / 3

Answer 1

When you solve a proportion, your first step should be to cross-multiply.

$\frac{2x}{5}$ = $\frac{x + 3}{3}$

When you cross-multiply, you should get this equation:

(2x)(3) = (x + 3)(5)

Now, solve it using algebra.

(2x)(3) = (x + 3)(5)       Multiply
       6x = 5x + 15         Subtract 5x from both sides
         x = 15

The value of x is 15.