2:7::1:?
You asked:
Solve \(2 : 7=1 : ?\) for the variable \(?\).
MathBot Answer:
$$\begin{aligned}? &= \frac{7}{2}\end{aligned}$$
Express both ratios as fractions. \[\frac{2}{7} = \frac{1}{?}\]
Cross-multiply and solve for the unknown. $$\begin{aligned}\frac{2}{7} &= \frac{1}{?} \\ 2 ? &= 7 \\ ? &&= \frac{7}{2} \end{aligned}$$