Three identical point charges, each with charge \(+q\), are initially infinitely far apart from each other. An external agent brings the charges together and fixes them at the vertices of an equilateral triangle with side length \(s\), requiring a total work \(W_1\). The distance from each vertex to the geometric center of the triangle is \(r = \dfrac{s}{\sqrt{3}}\). A fourth identical point charge \(+q\) is then brought from infinity and placed at the center of the triangle, requiring an additional work \(W_2\) done by the external agent. What is the ratio \(\dfrac{W_2}{W_1}\)?