## anonymous one year ago Write a proportion for the following problem. Eric is making a scale drawing of the ground floor of his house. If the scale is 2 in = 5 ft, what number of inches will he use for a length of 55 ft? A. 2/5 = 55/x B. 2/55 = x/5 C. 2/5 = x/55

1. anonymous

@Directrix

2. jdoe0001

$$\begin{array}{ccllll} in&ft \\\hline\\ 2&5\\ x&55 \end{array}\implies \cfrac{2}{x}=\cfrac{5}{55}$$

3. jdoe0001

notice, just line up the corresponding units vertically

4. anonymous

yes @jdoe0001

5. anonymous

would it be C ? @jdoe0001

6. jdoe0001

hmmm yeap, that'd work, since it yields the same equation

7. jim_thompson5910

Use jdoe0001's table to read down the columns to get $\Large \frac{2}{x} = \frac{5}{55}$ or read across the rows to get $\Large \frac{2}{5} = \frac{x}{55}$ The two equations are equivalent to one another. You can also flip the fractions of both sides to get other equivalent equations.