if you want the ratio to be 3:2 then the secret is to add the parts of this ratio 3+2=5 This is a five part ratio.
The total distance left to right is 10 between the two points, this divided by 5 is 2. 3 parts times 2 is 6. 2 parts times 2 is 4.
so the x coordinate of x has to be 6, 3/5 of the way from E to F horizontally.
The total vertical distance between the two points is 7--8=15. 15/5=3 3 parts times 3 is 9 so the Y coordinate of point X has to be 9 units down from E to F. 7-9=-2
The coordinate of point X are (6,-2)