Each triangle is equilateral. Is the relationship between the perimeter and the side length of the equilateral triangles proportional? Explain

We have the following:
[tex]\begin{gathered} s=1,p=3\cdot1=3 \\ s=2,p=3\cdot2=6 \\ s=3,p=3\cdot3=9 \end{gathered}[/tex]The perimeter is also proportional because it increases to the same measure