### Home > MC1 > Chapter 9 > Lesson 9.2.5 > Problem9-104

9-104.

Find the missing value in each of the following proportions.

For help solving proportions, refer to the Math Notes box below.

1. $\frac { x } { 12 } = \frac { 12 } { 18 }$

We can choose cross multiplication, which is Strategy $2$ in the Math Notes box above.
Your expression would then look something like this: $18x = \left(12\right)\left(12\right)$ Can you find the value of $x$ now?

How many $18$'s are in $144$? You can figure this out by dividing $144$ by $18$.

2. $\frac { 4 } { 5 } = \frac { m } { 45 }$

Here, try using a Giant One to change $\frac{4}{5}$ to a fraction over $45$. This will give you the value of $m$.

3. $\frac { 11 } { 40 } = \frac { p } { 100 }$

Which strategy do you like to use more? Both will work here, so remember to show your work!

The value of $p$ is $27.5$.