Rule 27b: The player may play a provisional ball until he reaches the place where the original ball is likely to be. If he makes a stroke with the provisional ball from the place where the original ball is likely to be or from a point nearer the hole than that place, the original ball is lost and the provisional ball becomes the ball in playunder penalty of stroke and distance (Rule 27-1).
I believe in that case the proximity of the provisional to the original is not a factor. Distance left to the hole would be the deciding factor on when you've reached the position of the original.
Thanks. That makes sense. However, knowing how particular some may be (especially legal types) when it comes to the wording of the Rules of Golf, is there anything in the Rules which specifies that distance, not proximity, is know the deciding factor in this case?