To find the distance, set up a proportion. A proportion is two equal ratios set equal to each other. We form the ratios by using corresponding values. We write a ratio of and simplify.
We know . We also know
.
We set them equal.
To find the width on the map, we cross multiply numerator and denominator.
<span>multiply equation by 36 to get rid of the denominators 36* - 36* = 36(6) Cancel the denominators 9d - 8d = 216 d = 216 mi to his house : : See if that checks out, find the actual speeds 216/4 = 54 mph 216/4.5= 48 mph ----------------</span>