SaiBook.us Geometry

Example

Title: Ratio & Proportion

Grade: 8-a Lesson: S2-L8

Explanation: The best way to understand algebra is by looking at some examples. Take turns and read each example for easy understanding.

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

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\$.