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Lesson Example Discussion Quiz: Class Homework

Example

Title: Ratio & Proportion

Grade: 8-a Lesson: S4-L8

Explanation: Hello Students, time to learn examples. Let us take turns and read each example. Explain each step. Pay special attention to steps and pictures and communicate in your own words.

Examples:

Find the third proportion to 6 , 8 and 10.

Step 1a

Here a = 6, b = 8, c = x and d = 10.

Explanation: Given proportion a = 6, b = 8 ,c = x and d = 10.

Step 1b

First, write in proportion form \$a/b\$::\$c/d\$ i.e., \$6/8\$::\$x/10\$.

Explanation: Let’s get started! Just write the proportion like this: \$a/b::c/d\$. For instance, you can use \$6/8::x/10\$.

Step 1c

Now, we are finding the third proportion x = \$(6 \times 10)/8\$ = \$7.5\$.

Explanation: We found the third proportion using x = \$(6 \times 10)/8\$ and got \$7.5\$ as the answer.

Step 1d

So, the third ratio is \$7.5\$.

Explanation: The third ratio equals \$7.5\$.