7,2:2,4=0,9:x

To solve for x, we can set up a proportion.

The given equation is 7.2:2.4 = 0.9:x

We can rewrite this proportion as:

7.2/2.4 = 0.9/x

To solve for x, we can cross-multiply:

(7.2)(x) = (2.4)(0.9)

7.2x = 2.16

Now, we can solve for x by dividing both sides by 7.2:

x = 2.16 / 7.2

x = 0.3

Therefore, the value of x is 0.3.