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

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

(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)*