Are the numbers 5, 6, 20, 18 in proportion?

Show that the numbers 25, 36, 5, 6 are not proportion.

Are the numbers 12, 18, 28 and 12 in proportion ?

Are 20, 18, 5, 6 in proportion?

Show that the numbers 25, 36, 5, 6 are not in proportion ?

Are 5, 10, 20 and 30 in proportion ?

Are the following numbers in proportion? 15,20,25,30.

What number must be added to each of the numbers 10, 18, 22, 38 to get the numbers which are in proportion ?

Check whether the following numbers are in proportion or not : 20, 18, 5, 6

What number should be added to each of the number 6, 14 , 18 , 38 so that the resulting numbers are in proportion ?

If the mean proportional of two numbers be 6 and the third proportional is 48, find the numbers.