Ratio and Proportion — MATHS STD 7 — Question

3. 1 : 1

Solution:

As, a : b = 3 : 4

$\Rightarrow\frac{\text{a}}{\text{b}}=\frac34$

So, $\text{4a}:\text{3b}=\frac{4\text{a}}{3\text{b}}$

$=\frac43\times\frac{\text{a}}{\text{b}}$

$=\frac43\times\frac34$

$=\frac{12}{12}$

$=\frac11$

$=1:1$

Hence, the correct alternative is option (c).