Answer
False
Work Step by Step
To determine if a proportion is true, we have to find if the cross products are equal.
The cross products of $\frac{a}{b}=\frac{c}{d}$ are $a \cdot d$ and $b \cdot c$.
$0.7*0.1=0.07, 0.3*0.4=0.12, 0.07 \neq 0.12 \rightarrow$ false