1. Set up a proportion:

* We know 12 inches on the map represent 100 miles in real life.

* We want to find out how many miles 1 inch represents.

* Let "x" represent the number of miles 1 inch represents.

This gives us the proportion: 12 inches / 100 miles = 1 inch / x miles

2. Solve for x:

* Cross-multiply: 12 inches * x miles = 1 inch * 100 miles

* Simplify: 12x = 100

* Divide both sides by 12: x = 100 / 12

* Calculate: x ≈ 8.33 miles

Answer: 1 inch on the map represents approximately 8.33 miles in real life.