Question 417475
I use what is called a "constant of proportionality" to solve these
Let {{{k}}} = constant of proportionality
given:
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{{{100 = k*((25*5)/.75)}}}
{{{.75*100 = 125k}}}
{{{125k = 75}}}
{{{k = 3/5}}}
{{{k = .6}}}
So, just plug this value in with new values
{{{S = .6*((40*8)/.5)}}}
{{{S = 1.2*40*8}}}
{{{S = 384}}}
The  new stress is 384 pounds/in2