solve the proportion 3.5/d = 14/15
3.5/d = 14/153.5*15=14d52.5=14dd=52.5/14=3.75
\(\dfrac{3.5}{d} = \dfrac{14}{15}\) \(3.5= \dfrac{14}{15}d\) \(3.5= \dfrac{14d}{15}\) \(3.5*15=14d\) \(52.5=14d\) \(52.5 /14 =14d /14\) \(d=3.75\)
