If a : b = 2 : 3 and c : b = 5 : 6, then a : b : c is equal to:
a:b:c=Â $$\left(a\times\ b\right):\left(b\times\ b\right):\left(b\times c\right)$$
   =$$\left(2\times\ 6\right):\left(3\times\ 6\right):\left(3\times\ 5\right)$$
   = 12 : 18 : 15 = 4 : 6 : 5
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