Jalisa buys 4 scrubs for $24.80. How much will it cost Jalisa to buy 7 scrubs?

This is a proportion/ratio problem. We have 4 scrubs for 24.80 dollars, so 7 for how much money? We can write that as a proportion:
Step 1: Rewrite the proportion as a fraction.
\(\frac{{4} }{{24.8}}\)
Step 2: Cross multiply.
\(4x=24.8 \times 7\)
Step 3: Simplify by dividing both sides of the equation by 28.
\(\frac{{4x} }{{4}}\) = \(\frac{{173.6} }{{4}}\)
X=43.4
Hint: When rewriting word problem proportions into fractions, you can choose which component (dollars or number of scrubs) goes in the numerator and which goes in the denominator. Just make sure that you arrange them the same on both sides of the equation.