Set up a proportion and solve for the missing term.<br><br>
&bull; 7 : 14 = 3.5 : _ means \(\frac{7}{14} = \frac{3.5}{x}\)<br>
&bull; Simplify the left ratio: 7 : 14 = 1 : 2<br>
&bull; So 1 : 2 = 3.5 : _, meaning \(\frac{1}{2} = \frac{3.5}{x}\)<br>
&bull; Cross multiply: 1 × x = 2 × 3.5, so x = 7<br><br>
Final Answer: 7