Find the fourth proportion to 5,10,15
Choose one: A) 10 B) 20 C) 42 D) 36 E) 30
30xplanation:   5:10 :: 15:x   =&gt; 5/10= 15/x   =&gt; x = 15*10/5   =&gt; x = 30   Answer:30
<result>E</result>
Find the fourth proportion to 5,10,15