Question

Show that 30,40,45,60 are not in proportion

Answer 1

We use cross product. To find cross product of proportion we use product of extreme term and mean term

30:40::45:60

30×60= 40×45

1800= 1800

They are in proportion

Answer 2

$\underline \bold {Solution:-}$

The numbers the said to be in proportion of the product of there extreme is equal to the product of there mean.

Here, extreme are:- 30 and 60

So, the product of extreme = 30 × 60 = 1800

And,

Mean are :- 40 and 45

So, the product of mean = 40 × 45 = 1800

Since , Product of extreme = Product of mean

So, they are in proportion.