Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
4. Writing and Solving Proportions
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Exercise 52 Page 210

Solve for the variable by using the Cross Products Property.

x=1.5

Practice makes perfect
To solve the proportion, we will start by using the Cross Products Property. Remember that we will need to treat 2x as a single quantity in the cross multiplication process.
2x/5 = 9/15
2x* 15 = 5*9
30x = 45
From here, we will continue solving for x by using the Division Property of Equality.
30x = 45
30x/30=45/30
x = 45/30
x=1.5