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Using experimental ultrasonic velocities and densities of binary solutions of Poly propylene glycol (PPG 400) in ethanol, 1-propanol and 1-butanol at 30°C, various acoustical parameters such as molar volume, available volume, free volume, van der Waal's constants, Wada's constant, internal pressure, coefficient of viscosity, surface tension and cohesive energy have been determined. Several thermo-dynamical parameters such as isothermal compressibility, ratio of specific heats, collision factor, space filling factor, geometrical volume, thermal expansion coefficient, index of refraction, Eykman's constant, molar refraction, relaxation time and pseudo-Gruneisen parameter have been evaluated. The obtained results are compared with experimental values wherever available. The variation of these parameters with change in mole fraction of the PPG 400 in the binary solution, is investigated to understand the nature, type and strength of molecular interactions prevalent in these systems. For several acoustical and thermo-dynamical parameters, excess parametric values and percentage deviations  have also been studied to confirm the results arrived at earlier. Using various empirical relations such as ideal mixing relation, Nomoto's relation, Van Dael and Vangeel relation, impedance dependence relation, Rao's specific velocity and Jungie's relation, ultrasonic velocities are calculated and the validity of these relations is assessed.