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Question

Mr. Fisher needed to apply 4.5 pounds of fertilizer per 1000 square feet of lawn for the type of grass in his lawn. if he has 2500 square feet of lawn, about how many pounds of fertilizer does he need to apply? create a proportion using words.

Answer 1

Hi Camila, here is what we know:

 

Mr. Fisher applies 4.5 pounds for 1,000 square feet...so the proportion is 4.5 pounds / 1,000 square feet. At this rate, we need to know how many pounds he needs to apply (which we will call "x") to 2,500 square feet...

 

So, we can say that 4.5 pounds is to 1,000 square feet as "x" pounds is to 2,500 square feet. The proportion would look like this:

 

4.5 pounds / 1,000 square feet = "x" pounds / 2,500 square feet

 

We can cross multiply to get:

4.5 pounds * 2,500 square feet = "x" pounds * 1,000 square feet

 

To solve for "x," we divide both sides by 1,000 square feet at get

"x" = 4.5 pounds * 2,500 square feet / 1,000 square feet = 11.25 pounds