Price of petrol is ₹78 per litre, then match the following prices with volumes of petrol.

We know that price of petrol is directly proportional to its volume i.e., as volume of petrol increases, its price also increases proportionately.

In direct proportion, ratio of two proportional quantities is always constant.

Given price of 1 litre petrol is ₹78.

For 2.2 litre of petrol, price will be
$\frac{x}{2.2}=\frac{78}{1}$
$⟹$ $x$ = ₹171.6

$\therefore$ Price of 2.2 litre petrol = ₹171.60

For price ₹130, volume of petrol will be
$\frac{130}{x}=\frac{78}{1}$
$⟹$ $x$ = 1.67 litre

$\therefore$ For ₹130, we get 1.67 litre of petrol.

For price ₹101.4, volume of petrol will be
$\frac{101.4}{x}=\frac{78}{1}$
$⟹$ $x$ = 1.3 litre

$\therefore$ For ₹101.4, we get 1.3 litre of petrol .


For 3.9 litre of petrol, price will be
$\frac{x}{3.9}$ = $\frac{78}{1}$
$⟹$ $x$ = ₹304.20
$\therefore$ Price of 3.9 litre of petrol = ₹304.20