In mathematics, a proportion is an equation that states that two ratios are equal. It can be written in the form a/b = c/d, where a, b, c, and d are numbers and b and d are not zero. Proportions are used to compare the relative sizes of different quantities. When two ratios are equal, they form a proportion.

Find the missing number in the proportion: 3/5 = x/15

Using the property of proportions, we can cross multiply to solve for the missing number. This means we multiply the extremes (3 * 15) and the means (5 * x), and then set the two products equal to each other:

3 * 15 = 5 * x 45 = 5x x = 9So, the missing number in the proportion is 9.If 4/7 = 12/y, find the value of y.

Again, we can use the property of proportions to solve for the missing number. We cross multiply the extremes (4 * y) and the means (7 * 12), and then set the two products equal to each other:

4y = 7 * 12 4y = 84 y = 21So, the value of y is 21.- If 2/3 = x/9, find the value of x.
- If 5/8 = 25/y, find the value of y.
- If 9/12 = 15/x, find the value of x.

Once you've completed the practice problems, you can check your answers below:

- x = 6
- y = 40
- x = 20

Study GuideGraphs Activity LessonVenn Diagrams Worksheet/Answer key

Graphs Worksheet/Answer key

Graphs Worksheet/Answer key

Graphs Worksheet/Answer key

Graphs Worksheet/Answer key

Graphs Worksheet/Answer key

Graphs Worksheet/Answer key

Single Line Graph Worksheet/Answer key

Single Line Graph Comprehension Worksheet/Answer key

Single Line Graph Comprehension Worksheet/Answer keySingle Line Graph Worksheet/Answer keySingle Line Graph Worksheet/Answer keySingle Line Graph Worksheet/Answer keySingle Line Graph Worksheet/Answer keySingle Line Graph Worksheet/Answer keySingle Line Graph

Data Analysis and Probability (NCTM)

Formulate questions that can be addressed with data and collect, organize, and display relevant data to answer them.

Select, create, and use appropriate graphical representations of data, including histograms, box plots, and scatterplots.

Select and use appropriate statistical methods to analyze data.

Discuss and understand the correspondence between data sets and their graphical representations, especially histograms, stem-and-leaf plots, box plots, and scatterplots.