Question

Fill in the blanks:

If 1, 2, 3 and x are in proportion, then x = .............

Answer 1

1 : 2 : : 3 : x
$$\begin{gathered} \Rightarrow \frac{1}{2}=\frac{3}{x} \\ \Rightarrow \frac{1\times 2\times x}{2}=\frac{3\times 2\times x}{x} \\ \Rightarrow x=6 \end{gathered}$$

Hence, x = 6 .