Question

Find the missing number in the following proportion​

Answer 1

Step-by-step explanation:

15:90=13:

ad=bc

15x=90x13

x=6x13

x=78

Answer 2

Answer:

let missing no. be x

so, 15:90=13:x

13*90=15x

x=13*90/15

x=13*6

x=78

so your answer is X that is equals to 78