Find the HCF of all three numbers and divide each term by it.<br><br>
&bull; HCF of 4, 8, and 12 is 4.<br>
&bull; 4 ÷ 4 = 1<br>
&bull; 8 ÷ 4 = 2<br>
&bull; 12 ÷ 4 = 3<br>
&bull; Simplest form: 1 : 2 : 3<br><br>
Final Answer: 1:2:3