solve the proportion 3/4=15/2x

Question

how do you go about solving a problem like this?

Answer 1

multiply x and 4 on both sides and divide everything by 3. x=(15/2)*(4/3)

Answer 2

The easiest way to approach this problem is like this.

 

1) Cross multiply. So you say (2X times 3)=(15 times 4).

2) Multiply what you can and meanwhile just leave the X as is. So now 2 times 3x= 6x And 15 times 4 = 60

3) Now we have 6x=60.

4) Isolate X by dividing both sides by the number next to x. 6x/6=x and 60/6=10. Now we have x=10