So first let's set up the equation.
x/4 = 14/16
Now to find the value of x, we cross-multiply. So
x · 16 = 14 · 4
Now we get
16x = 56
To find x we need to get x by itself on one side. To do this we divide 16 on both sides of the equation
16x/16 = 56/16
Simplify and we get
x = 7/2 or 3.5
Hope I helped!