3/5 of the way from -2.4 to 6.8

The distance between two points is found by subtracting the beginning point from the ending point.

6.8 - -2.4  =  9.2

(3/5) of 9.2  =  (3/5) x 9.2  =  5.52

This distance must be added to the beginning piont:  -2.4 + 5.52  =  3.12  <---