Question

what is the common ratio of a4=4 and a7=12

Answer 1

there is not one; nothing times four that will give you four multiplied by seven will give you twelve

Answer 2

you dont multiply 4x7. they are only term numbers

Answer 3

I understand that. What I am saying is there is no number, when multiplied by four that will give you four, and when multiplied by seven will give you twelve.