Final answer:
To find the total number of girls at Ford Middle School, set up a proportion using the given percentages and total number of students. Cross-multiply and solve for the number of girls.
Step-by-step explanation:
To find the total number of girls at Ford Middle School, we can set up the proportion:
Girls / Total Students = % of Girls / 100
Plugging in the given values, we have: Girls / 400 = 43 / 100
Cross-multiplying, we get: Girls = (43 / 100) * 400 = 172
Therefore, there are 172 girls at Ford Middle School.