# How do you convert 7.8 km to miles?

Aug 17, 2016

$x = 4.875 \text{ miles}$

#### Explanation:

You need to know a conversion factor.

5 miles = 8 km OR 1 mile = 8/5 km OR 1 km = 5/8 mile

For the same distance, the number of miles is less than the number of km.

$7.8 k m \times \frac{5}{8} = 4.875 \text{ miles}$

Or by direct proportion:

$\left(\text{miles")/("km}\right) = \frac{x}{7.8} = \frac{5}{8}$

$x = \frac{7.8 \times 5}{8}$

$x = 4.875 \text{ miles}$