1) To find the value of X in the first proportion (6,4:0,16=4:Х), we can cross multiply:

6,4 X = 0,16 4
6,4X = 0,64

Dividing by 6,4 on both sides:

Х = 0,64 / 6,4
Х = 0,1

Therefore, X = 0,1.

2) To find the value of X in the second proportion (0,75:1,5=5:Х), we can cross multiply:

0,75 X = 1,5 5
0,75X = 7,5

Dividing by 0,75 on both sides:

Х = 7,5 / 0,75
Х = 10

Therefore, X = 10.