In the parallelogram ABCD, point E is the midpoint of AB side, point F is on the line ad, AF = 3DF, connects EF, intersects with diagonal AC at point m, then the value of MC: am is______ .

In the parallelogram ABCD, point E is the midpoint of AB side, point F is on the line ad, AF = 3DF, connects EF, intersects with diagonal AC at point m, then the value of MC: am is______ .

As shown in the figure: make FG ∥ DC, AC and G, ∥ AFG ∥ ADC, ∥ AF = 3DF, ∥ agac = afad = FGDC = 34, ∥ FG = 34dc, Ag = 34ac. ∥ ame ∥ GMF, AE = 12DC, ∥ ammg = aefg = 12dc34dc = 23, am = 25ag = 25 × 34ac = 310ac, MC = 710ac, MCAM = 710ac310ac = 73