Question

How do you complete the proportion `4/5=x/15`?

Answer 1

Multiply each side of the equation by `15` to find `x`. See full process below:

Explanation:

Multiply each side of the equation by `color(red)(15)` to find `x`.

`color(red)(15) xx 4/5 = color(red)(15) xx x/15`

`60/5 = cancel(color(red)(15)) xx x/color(red)(cancel(color(black)(15)))`

`12 = x`

Substituting `12` for `x` gives:

`4/5 = 12/15`