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Gd5(SixGe1-x)4 exhibits a first order phase transition for the compositions 0 <; x <; 0.575 leading to a magnetic phase transition as well. It is not possible to measure the second order phase (magnetic) transition temperatures of the individual phases with direct measurements. This is because the first order phase transition occurs before the second order phase transition. With modified Arrott plots we have shown previously that it is possible to estimate the second order phase transition of the Gd5Si4 -type orthorhombic phase. In this paper we have estimated the second order phase transition temperature of the Gd5Si2Ge2-type monoclinic phase using a single crystal sample of Gd5Si1.5Ge2.5 (0.375) which falls in the mixed phase region of the sample.