Question

Solve for a in the proportion.

a
5
=
9
45


a =

Answer 1

To solve for \( a \) in the proportion

\[
\frac{a}{5} = \frac{9}{45},
\]

we can start by cross-multiplying:

\[
a \cdot 45 = 5 \cdot 9.
\]

Calculating the right-hand side:

\[
5 \cdot 9 = 45.
\]

So, we have:

\[
45a = 45.
\]

Now, we can divide both sides by 45:

\[
a = \frac{45}{45}.
\]

This simplifies to:

\[
a = 1.
\]

Thus, the solution is:

\[
\boxed{1}.
\]