What is the scale if: 3.2 cm on the map correspond to 4 km in the actual distance?

Scaling on map is defined as the ratio of a distance on the map to the corresponding distance on the ground.

Here, 3.2 centimeters on the map is equivalent to 4 kilometers.

We can use unitary method to find, how many kilometer/kilometers each centimeter corresponds to.

Using the unitary method:

Therefore, the scale of map represents 1.25 kilometers for each centimeter.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225