Question 101788
 
 since {{{x}}} and {{{y}}} are directly proportional, there must be such of number {{{n}}} where {{{y=n*x}}}

{{{ x : (3/2) = y : (1/4)}}}
then

{{{x*(1/4) = y*(3/2)}}}
{{{ y = (1/4)*x/(3/2)}}}
{{{y = (1/4)*(2/3) *x}}}
{{{y =(1/6)x }}}            so, {{{n=1/6}}} 

if {{{x=54}}} we have
{{{y=(1/6)*54}}}
{{{y = 9}}}        

check:
{{{ x : (3/2) = y : (1/4)}}}
{{{ 54 : (3/2) = 9: (1/4)}}}
{{{108:3 = 36:1}}}
{{{36 = 36}}}