Set up a proportion and solve for the missing term.<br><br>
&bull; 12 : _ = 30 : 25 means \(\frac{12}{x} = \frac{30}{25}\)<br>
&bull; Simplify the right ratio: 30 : 25 = 6 : 5 (divide both by 5)<br>
&bull; So \(\frac{12}{x} = \frac{6}{5}\)<br>
&bull; Cross multiply: 12 × 5 = 6 × x, so 60 = 6x, x = 10<br><br>
Final Answer: 10