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Activity Discussion Math Explain Ratio and proportion with examples?

• # Explain Ratio and proportion with examples?

Posted by on May 15, 2021 at 10:34 am

Explain Ratio and proportion with examples?

• This discussion was modified 3 years ago by  Kidpid.
replied 3 years ago 2 Members · 1 Reply
• ### Shivani

Member
May 17, 2021 at 9:44 am
1

A ratio is a comparison of two numbers. We generally separate the two numbers in the ratio with a colon (:). Suppose we want to write the ratio of 8 and 12.
We can write this as 8:12 or as a fraction 8/12, and we say the ratio is eight to twelve.

Examples:

Jeannine has a bag with 3 videocassettes, 4 marbles, 7 books, and 1 orange.

A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal.
3/4 = 6/8 is an example of a proportion.

When one of the four numbers in a proportion is unknown, cross products may be used to find the unknown number. This is called solving the proportion. Question marks or letters are frequently used in place of the unknown number.

Example:

Solve for n: 1/2 = n/4.
Using cross products we see that 2 Ã— n = 1 Ã— 4 =4, so 2 Ã— n = 4. Dividing both sides by 2, n = 4 Ã· 2 so that n = 2.

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