Suppose the second & third numbers are 2x & 3x respectively. ATQ, 5x × 6x = 4320 30 x2 = 4320 x2 = 144 x = 12 So, second number = 5x = 5 × 12 = 60 Third number = 6x = 6 × 12 = 72 Ratio of first & second number = 3⁄4 Hence, first number = (3⁄4)*60 = 45 Sum of these 3 numbers = 60 + 72 + 45 = 177