It is important to calculate thermodynamic or other physicochemical properties in terms of some known data. The thermodynamic properties for a ternary system have already been successfully calculated in terms of corresponding binary information through a geometrical model. However, it is difficult to calculate thermodynamic or other properties of a multicomponent system based on some limited discrete data. In this article, a method has been suggested for predicting thermodynamic or other physicochemical properties in a multicomponent system based on some limited discrete data. This issue is particularly significant for metallurgical systems in which the available data are very limited due to the difficulty with experimental measurements and the unavailability of an effective calculation method.