Constant of proportionality from equations

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Problem

What is the constant of proportionality in the equation $y=\dfrac54x$y, equals, start fraction, 5, divided by, 4, end fraction, x?

constant of proportionality $=$equals 

Hint #11 / 2

If the constant of proportionality is $\greenD{k}$start color #1fab54, k, end color #1fab54, then:

$\maroonD{y}=\greenD{k}\blueD{x}$start color #ca337c, y, end color #ca337c, equals, start color #1fab54, k, end color #1fab54, start color #11accd, x, end color #11accd

What number do we multiply by $\blueD{x}$start color #11accd, x, end color #11accd to get $\maroonD{y}$start color #ca337c, y, end color #ca337c?

Hint #22 / 2

The constant of proportionality is $\greenD{\dfrac{5}{4}}$start color #1fab54, start fraction, 5, divided by, 4, end fraction, end color #1fab54.