Question 455475


{{{3/5=15/x}}}.....cross multiply

{{{3x=15*5}}}

{{{3x=75}}}

{{{x=75/3}}}

{{{x=25}}}


the missing number in the proportion is {{{25}}}


{{{3/5=15/25}}}...if you simplify right side dividing both numerator and denominator by {{{5}}} you will get:

{{{3/5=(15/5)/(25/5)}}}


{{{3/5=3/5}}}