Find the fourth proportion to 5,10,85	Options:
A) 180
B) 120
C) 170
D) 75
E) 100
Explanation:   5:10 :: 85:x   =&gt; 5/10 = 85/x   =&gt; x = 850/5   =&gt; x = 170   Option 170
<result>C</result>
Find the fourth proportion to 5,10,85