Table of Contents
- Terms used in Proportion
- Summary
- What’s Next?
In the previous segment of Class 6 Maths, we understood the logic behind the proportionality test. Here let us learn about the terms used in proportion.
What are the terms used in proportion?
Consider two ratios a : b and c : d, such that ? = ? . Thus, a : b : : c : d.
? ?
Here, a is known as the first term, b is known as the second term, c is known as the third term, and d is known as the fourth term.
The terms a and d are at the extreme ends and hence, known as the extremes. The terms b
and c are in the middle and hence, known as the means.
When the terms a, b, c, and d are in proportion, that is a : b : : c : d, the product of extremes = the product of means. That is, a x d = b x c.
For example,
Consider 6 ??? 3 . ????, 6 = 3 Thus, 6 : 10 : : 3 : 5.
.
10 5 10 5
Hence, 6, 10, 3, and 5 are in proportion. 6 and 5 are the extremes while 10 and 3 are the means. Product of the extremes = 6 x 5 = 30.
Product of the means = 10 x 3 = 30.
Thus, the product of extremes = the product of means.
Summary
Terms used in Proportion |
– a is the first term, b is the second term |