The first three terms of a proportion are 5, 15 and 20. The fourth term is?	Options:  A) 60  B) 65  C) 89  D) 78  E) 88
(15*20)/5= 
<gadget id="calculator">(15*20)/5</gadget>
<output>60</output>
60   60nswer:60
<result>A</result>
The first three terms of a proportion are 5, 15 and 20. The fourth term is?