Question

What is 3/7k = 12/35

Answer 1

$\frac{3}{7} k= \frac{12}{35}$

First. Lets divide those fraction so the problem is easier to work with.

0.42k=0.34

Now, divide both sides by 0.42 to get k by it's self.

You should get k=0.81

Answer 2

3/7 * 4 = 12/35 (Is this what your asking for?)