Asked by Bryan

How do i use cross multiplication to decide wheather a proportion is true or false?

3/4 = 15/16
Answered by Ms. Sue
3 * 16 =?? 4 * 15
Answered by Bryan
4 * 15= 60
3 * 16= 48

now what i do? how do i know if its true or fasle?
Answered by Ms. Sue
Does 60 = 48??
Answered by Bryan
Oh okay.. the number has to be the same in order for it to be true. So this problem would be false
Answered by Ms. Sue
Right. By cross-multiplying, you've proved this proportion to be false.
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