SOLUTION: Four ropes are tied to an object. One of the ropes is being pulled with Force 1 of 6 N, the other is being pulled with Force 2 of 15 N, and another is being pulled with Force 3 of 
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Question 1181947:  Four ropes are tied to an object. One of the ropes is being pulled with Force 1 of 6 N, the other is being pulled with Force 2 of 15 N, and another is being pulled with Force 3 of 12 N. What force should be exerted on the fourth rope to keep the object from moving? (To keep the object from moving, the net force must be zero)
 
Answer by ikleyn(52903)   (Show Source): You can put this solution on YOUR website!
 .
Assuming that all four forces are directed along one line, but (probably) in different directions,
add the first three forces and take the fourth force as the sum of the three forces, but apply it in opposite direction.
 
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