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The magic of proportions

The magic of proportions. By Mrs. Pearson. I have a photo of my daughter Sarah and I want to enlarge it and make it into a poster. The photo is 4 inches by 6 inches. The poster maker uses a scale factor of . I want to find out what size the poster will be. 5 1. poster photo. 5 1.

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The magic of proportions

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  1. The magic of proportions By Mrs. Pearson

  2. I have a photo of my daughter Sarah and I want to enlarge it and make it into a poster. The photo is 4 inches by 6 inches. The poster maker uses a scale factor of . I want to find out what size the poster will be. 5 1 poster photo 5 1 Think: = w 6 l 4 5 1 Write a proportion to find the length l and one for the width w. 5 1 = = 1*w = 6*5 1*l = 4*5 Find the cross products. w= 30 l= 20 The poster will be 20 in. long and 30 in. wide.

  3. We are taking a field trip to Pittsburg. On a road map, the distance between Philadelphia and Pittsburgh is 7.5 inches. What is the actual distance between the cities if the map scale is 1.5 inches = 60 miles? Let d be the actual distance between the cities. 1.5 60 7.5 d = Write a proportion. 1.5 · d = 60 · 7.5 Find the cross products. 1.5d = 450 Multiply. 450 1.5 1.5d 1.5 = Divide both sides by 1.5. d = 300 The distance between the cities is 300 miles.

  4. If we drive at a rate of 60 miles per hour, how long will it take us to get to Pittsburg? Let t be the time it will take for us to travel. 60 miles 1 hour 300 miles t hours = Write a proportion. Find the cross products. 60· t = 1 · 300 Multiply. 60d = 300 Divide both sides by 60. 300 60 60d 60 = d = 5 It will take us 5 hours to travel between the cities.

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