Curated OER
What's the Means-Extremes Property of Proportions?
Watch how easy solving proportions can be. Using the means-extremes property of proportions you'll be able to solve a variety of proportion problems. Example problems are worked to show you how this property looks in action. Hint:...
Khan Academy
Khan Academy: Algebra: Alternate Solution to Ratio Problem
A step-by-step demonstration on an alternate method for how to solve a ratio problem algebraically with cross multiplication. [7:02]
Khan Academy
Khan Academy: Algebra 2: Solving Rational Equations 1
A step-by-step breakdown on how to solve a rational equation with constraints. [4:12]
Khan Academy
Khan Academy: Algebra: Find an Unknown Proportion 2
A step-by-step breakdown on how to solve an application problem with an unknown proportion. Practice problems available. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [5:48]
Khan Academy
Khan Academy: Algebra: Find an Unknown in a Proportion
Video demonstrates how to find an unknown in a proportion three different ways including algebraically with cross multiplication. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [7:20]
Khan Academy
Khan Academy: Algebra: Ratio and Proportion
Step-by-step instructions on how to solve ratio and proportion word problems. This video is also found in the strand Algebra: ck12.org. [10:25]
Khan Academy
Khan Academy: Ratios With Algebra: Find an Unknown in a Proportion
Video demonstrates how to find an unknown in a proportion three different ways..
Sophia Learning
Sophia: Equivalent Ratios
Students learn about equivalent ratios in this video lesson. The tutorial consists of detailed examples that explore the mathematics concept.
Loyola University Chicago
Math Flix: Similar Figures: Proof Using Proportions
This QuickTime movie provides an opportunity to develop the basic geometric term, similar, by checking to see if figures are proportionaly similar. As you watch and listen to the teacher and student interact it helps clarify the thinking...
Loyola University Chicago
Math Flix: Similar Figures: Cross Multiplication
This QuickTime movie provides an opportunity to develop the basic geometric term, similar, by using cross multiplication to see if figures are similar. As you watch and listen to the teacher and student interact it helps clarify the...
Sophia Learning
Sophia: Equivalent Ratios: Lesson 6
This lesson will introduce the means and extremes of a proportion, and demonstrate how to use cross multiplication to determine if two ratios are equivalent. It is 6 of 8 in the series titled "Equivalent Ratios."
Sophia Learning
Sophia: Equivalent Ratios: Lesson 1
This lesson will introduce the means and extremes of a proportion, and demonstrate how to use cross multiplication to determine if two ratios are equivalent. It is 1 of 8 in the series titled "Equivalent Ratios."
Sophia Learning
Sophia: Solving More Difficult Proportions With an Unknown #5
This lesson will present how to solve for unknown variables in more difficult proportion problems.