Are 20, 18, 5, 6 in proportion?

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

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

Find the value of a given that 3, a, 5, 20 are in proportion.

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

x is the 4th proportional to 12, 16 and 5, and 20, y, 15, 21 are in proportion. Then the value of (6x-y) is: x, 12, 16 और 15 का चौथा समानुपाती है , तथा 20, y, 15, 21 समानुपात में हैं |(6x-y) का मान है :

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

if 3, x, 6, 18 are in proportion , then x =

Are 5, 10, 20 and 30 in proportion ?

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

Find x if 4, 6, x, 18 are in proportion 3. The first, third and fourth terms of a proportion are 12.8 and 14 respectively. Find the second term.