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Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,*,*,Use cross products to determine whether the ratios form a proportion.,Solving Proportions,COURSE 3 LESSON 5-4,a.,5,13,13,33,b.,7,12,21,36,Write cross,products.,5 33 13 13,Test by writing,as a proportion.,5,13,13,33,7,12,21,36,7 36 12 21,165 169,Simplify.,=,/,252=252,5-4,Solve each proportion.,Solving Proportions,COURSE 3 LESSON 5-4,a.,=,5,32,10,p,Write the cross products.,5,p=,32 10,Multiply.,5,p=,320,p=,64,Simplify.,=,5,p,5,320,5,Divide each side by 5.,5-4,(continued),Solving Proportions,COURSE 3 LESSON 5-4,b.,=,3,5,q,54,Estimate,The ratio is close to ,so,q,is about of 54,or 27.,3,5,1,2,1,2,Write the cross products.,3 54=5,q,Multiply.,162=5,q,Divide each side by 5.,=,5,q,5,162,p,5,Simplify.,32.4=,q,Check for Reasonableness,The answer 32.4 is close to the,estimate 27.The answer is reasonable.,5-4,The fixed rate of conversion is 1 euro=0.7876 Irish pounds.How many euros would you receive for 125 Irish pounds?,Solving Proportions,COURSE 3 LESSON 5-4,You would receive 158.71 euros.,Let,p,=the number of euros.,=,0.7876,1,125,p,Write the,proportion .,Irish pounds,euros,0.7876,p,=1 125,Write the cross products.,=,0.7876,p,0.7876,125,0.7876,Divide each side by 0.7876.,125,0.7876 158.710005,Use a calculator.,5-4,Solve each proportion.,1.,=,2.,=,3.,Suppose the exchange rate for dollars to Indian rupees is 0.02.How many rupees should you receive for$100?,w,12,3,4,20,r,4,5,Solving Proportions,COURSE 3 LESSON 5-4,9,25,5,000 rupees,5-4,
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