IMPLEMENTATION: Solve the proportion.
4 gallons
1120 sq:ft:
¼
7 gallons
xsq:ft:
1120 7 ¼ 4 x
7840 ¼ 4 x
7840
4
¼
41 x
41
1960 square feet ¼x
7 gallons will cover 1960 square feet.
EVALUATION:
4
1120
¼
7
1960
1120 7 ¼ 4 1960
7840 ¼ 7840
EXAMPLE:If the scale on a map reads 2 inches¼50 miles, how many miles
are there between two cities whose distance on a map is 7.5 inches?
SOLUTION:
GOAL: You are being asked to find the distance between two cities.
STRATEGY: The ratio statement is2 inches50 miles. The proportion is50 miles2in: ¼x^7 :miles5in:.
LESSON 6 Using Proportions 55