Question

For the proportion, find the unknown number n. 28/4=21/n

Answer 1

The proportion to solve is:

`(28)/(4)=(21)/(n)`

We can cross multiply and do a little algebra to solve for the unknown variable n.

The steps are shown below:

`\begin{gathered} (28)/(4)=(21)/(n) \\ 28n=4*21 \\ 28n=84 \\ n=(84)/(28) \\ n=3 \end{gathered}`

The unknown variable, n, is:

n = 3

Answern = 3