The tactics of the Sherman columns was for four Shermans to travel in a diamond shape. As the Tiger opened fire from the bocages of Normandy, its position would be revealed. Most likely the first shot would destroy the first Sherman, as the two on the flanks moved forward the last went (as Nighthawk correctly stated) to try and flank the Tiger.
At about 75 yards to the Tigers rear the Sherman could destroy it. This is a very clean cut situation, but this is how it was supposed to work. 3:1 Sherman:Tiger in Normandy is a recognised figure.
However this is PURELY in the bocages of Normandy. In the rest of France, Germany and Holland armour battles were as anywhere else. And Tigers were not defensive positions, they were TANKS! Designed to move quickly on an operational move and take on other tanks. On top of that, the Tiger wasn't the main battle tank of the Wehrmacht. The Pz. kpfw. IV was, this was a match for the Sherman...as the Sherman was a match for it.
The Sherman was not a tank for people with a death wish, it was a tank for ease of produce and ease of handling for conscripts. The tank was produced quickly, and its production run alone can put up with the best tanks of the war.
Everyone loves the T-34 because it was simple and easy to produce, the Sherman was exactly the same but even simpler.