Solving Proportions in Three Easy Steps

This video tutorial covers lesson 5.4 on solving proportions. It begins with an introduction to the topic, followed by a detailed explanation of the steps involved in solving proportions: cross-multiplying, isolating the variable, and solving for the unknown. The tutorial includes several example problems, ranging from basic to advanced, demonstrating the application of these steps. Additionally, it explores solving proportions using graphs and tables. The lesson concludes with a summary and a reminder to note down key points.

What is the first step in solving proportions as discussed in the video?

• Add the products together

• Isolate the variable using subtraction

• Cross multiply the terms

• Divide both sides by the coefficient of the variable

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CCSS.6.EE.B.7

After cross-multiplying, what should you do next according to the lesson?

• Add both sides to get a sum

• Divide to isolate the variable

• Subtract the smallest product from the largest

• Multiply again to check consistency

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CCSS.HSA.REI.A.2

In the example, if 5 times 21 equals 105, what does 7 times X equal?

• 15

• 105

• 7X

• Cannot be determined

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CCSS.2.OA.C.3

What is the value of 'W' when 9W equals 36?

• 45

• 9

• 5

• 4

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CCSS.6.EE.B.7

How do you solve for 'a' when 10a equals 180?

• Multiply 10 by 18

• None of the above

• Divide 180 by 10

• Subtract 10 from 180

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CCSS.6.EE.B.7

What is the result for 'X' when 7X equals 56?

• 8

• 7

• 49

• None of the above

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CCSS.6.EE.B.7

In a tricky problem, if 15Z plus 15 equals 240, what is Z?

• 14

• 15

• 225

• 16

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CCSS.7.EE.B.4A

On a graph, if 100 miles cost $7.50, how much would 200 miles cost?

• $15.00

• $20.00

• $7.50

• $10.00

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CCSS.6.RP.A.3B

How many bracelets can you make with 80 inches of twine if 3 bracelets require 48 inches?

• 5

• 6

• 4

• 3

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CCSS.6.RP.A.3B

What is the correct setup for a proportion if you have 3 bracelets for 48 inches and need to find out how many for 80 inches?

• 80/48 = X/3

• X/48 = 3/80

• 48/3 = 80/X

• 3/48 = X/80

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CCSS.7.RP.A.2C