5 is being compared to 14.
\So,5 is the part and 14 is the whole.
\Let n represent the percent.
\The percent proportion is
.
Apply cross product property of equality:
then
.

(Multiply:
)
Apply division property of equality: Divide each side by 14.
\
(Cancel common terms)
(Divide:
)
5 is 37.5
of 14.