Question 891071
Converting the variation description into symbolism,


{{{highlight_green(v=kAh)}}}, using k as the variation constant.


Find formula for k.
{{{k=v/(Ah)}}}
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Use the given values to find value of k.
{{{k=75/(45*5)}}}
{{{k=(3*5*5)/(3*15*5)}}}
{{{k=1/3}}}.
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Formula for v is {{{highlight(v=(1/3)Ah)}}}.


You can use the formula for any combination of values of A and h.