Question 146808
You need to keep the same ratio of 3:4 so multiply both by a and set the length equal to 1.
[3a,4a]
{{{(3a)^2+(4a)^2=1}}}
{{{9a^2+16a^2=1}}}
{{{25a^2=1}}}
{{{a^2=1/25}}}
{{{a=1/5}}}
[3/5,4/5] has the same direction and now has a length of 1.