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$\dfrac {1} {2}:\dfrac {1} {3}:\dfrac {1} {4}$

$=\left( \dfrac {1} {2}\times 12\right) :\left( \dfrac {1} {3}\times 12\right) :\left( \dfrac {1} {4}\times 12\right)$

(12 is the lowest common multiple of 2, 3, and 4) 

$=6:4:3$

Meaning of Lowest Common Multiple

It's a lowest quantity that is a multiple of two or more given quantities.

(Source: Yahoo answer, Google)

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