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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 18 Page 208

Solve for the variable by using the Cross Products Property.

c = 24, see solution.

Practice makes perfect
Notice that in the given equation c is only present within the denominator of a single fraction. 15/8 = 45/cTo solve this proportion, we will start by using the Cross Products Property. That way we will eliminate fractions and move c from the denominator. Let's do it!
15/8 = 45/c
CrossMult

Cross multiply

15 * c = 45 * 8
Multiply

Multiply

15c = 360
From here, we will continue solving for c by using the Division Property of Equality.
15c = 360
DivEqn

.LHS /15.=.RHS /15.

15c/15=360/15
DenomMultFracToNumber

15 * a/15= a

c = 360/15
CalcQuot

Calculate quotient

c = 24
Subchapter links expand_more
arrow_right Try It p.204-206
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Try It 2 (Page 204)
Try It 3 (Page 204)
Try It 4 (Page 204)
Try It 5 (Page 204)
Try It 6 (Page 204)
Try It 7 (Page 205)
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arrow_right Self-Assessment for Concept & Skills p.206
Self-Assessment for Concept & Skills 14 (Page 206)
Self-Assessment for Concept & Skills 15 (Page 206)
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arrow_right Self-Assessment for Problem Solving p.207
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arrow_right Review & Refresh p.208
Review & Refresh 1 (Page 208)
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Review & Refresh 7 (Page 208)
arrow_right Concept, Skills, & Problem Solving p.208-210
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