This graph shows a proportional relationship.


A graph with a line running through coordinates (0,0) and coordinates (fraction 1 over 4, fraction 3 over 8)


https://static.k12.com/nextgen_media/assets/8075772-NG_IMB_G_04_06_Quiz_06.png


What is the constant of proportionality?


Enter your answer as a ratio in simplified form in the box.