Place third charge so that it experiences no force

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To find the position of a third charge that experiences no net force between a +6.2 µC charge at the origin and a -3.9 µC charge at x = 25 cm, the forces acting on it must balance. The relevant formula for the force between charges is F=kq_1q_2/r^2. The discussion suggests drawing a free body diagram to visualize the forces acting on the third charge. It is implied that the third charge will need to be placed closer to the negative charge to achieve equilibrium. The exact coordinates for placement depend on the calculated forces and their balance.
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1. A +6.2 µC charge is placed at the origin and a -3.9 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed so that it experiences no net force?



2. F=kq_1q_2/r^2

3. I got 3.48 as the velocity between the first to charges. Now I am stuck.
 
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Draw out a free body diagram for this third charge. Will its location be inbetween the first 2 charges or to one side? Which one will it need to be closer to?
 

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