Question 1136820
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The 1.5 factor is the scale factor between the two similar cones; it is the 3:2 ratio between any linear measurements of the two cones.<br>
If the height of the smaller cone is 12cm and the ratio is 3:2, then the height of the larger cone is 12(3/2) = 18cm.<br>
If the scale factor is 3:2, the ratio of any area measurements between the two cones is the square of that, 9:4.  So if the surface area of the smaller cone is 124 cm^2, then the surface area of the larger cone is 124(9/4) = 279 cm^2.