Select the equation that is a proportion.
5
9
=
30
54
\displaystyle \frac{{5}}{{9}}=\frac{{30}}{{54}}
9
5
=
54
30
5
9
=
45
54
\displaystyle \frac{{5}}{{9}}=\frac{{45}}{{54}}
9
5
=
54
45
5
x
9
=
x
81
\displaystyle \frac{{{5}{x}}}{{9}}=\frac{{x}}{{81}}
9
5
x
=
81
x
30
x
54
=
x
81
\displaystyle \frac{{{30}{x}}}{{54}}=\frac{{x}}{{81}}
54
30
x
=
81
x
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