The third proportional to 1 and 2 is?	Pick:  A) 8  B) 7  C) 4  D) 5  E) 3
(2*2)/1= 
<gadget id="calculator">(2*2)/1</gadget>
<output>4</output>
4   Answer:4
<result>C</result>
The third proportional to 1 and 2 is?