How do u find if the following numbers are in proportion= (a) 15,20,30,40, (b) 1,2,2,4, (c) 18,36,144,288. [Please I need to know the method even].[Its urgent!!!!!!]

In order to check whether the given numbers are in proportion or not, firstly we find the ratio among 4 numbers by taking 2 at a time. When the ratio of two pairs come equal then we separate them with proportion sign. Now, the given set of numbers will be in proportion.

a)

We have,

15, 20, 30, 40.

Now, we try to find out the ratio of any two given set of number and will verify whether they are equal or not.

Firstly we take a pair of  15 and 20 and another pair of 30 and 40.

Ratio of 15 and 20 = 15 : 20 = 3 : 4 and

ratio of 30 and 40 = 30 : 40 = 3 : 4.

As the two ratios are equal. So, the numbers 15, 20, 30 and 40 are in proportion as:

15 : 20 :: 30 : 40

b)

We have,

1, 2, 2, 4.

Again, we take a pair of  1 and 2 and another pair of 2 and 4.

Now, the ratio of 1 and 2 = 1 : 2 and

ratio of 2 and 4 = 2 : 4 = 1 : 2.

Again, the two ratios are equal. So, the numbers 1, 2, 2 and 4 are in proportion as:

1 : 2 :: 2 : 4

The same process is also applied to the third part. Try solving it yourself and if you face any difficulty then do get back to us.

  • 0
What are you looking for?