In the following proportion, write means, extremes, product of means and product of extremes.

Proportion	Means	Extremes	Product of Means	Product of extremes
$100:75::4:3$

In the following proportion, write means, extremes, product of means and product of extremes.

If first, second, and third terms of a proportion are $2, 3$ and $90$ respectively, then find the fourth term of the proportion.

If first, second, and fourth terms of a proportion are $10, 7$ and $35$ respectively, then find its third term.

If second, third and fourth terms of a proportion are $18, 10$ and $20$ respectively, then find its first term.

If first, third and fourth terms of a proportion are $1.5, 4.5$ and $9.0$ respectively, then find its second term.

Do the following ratio form a proportion?

$25 \mathrm{cm}:75 \mathrm{cm} \text{and} ₹ 80:₹ 240$

Do the following ratio form a proportion?

$10 \mathrm{km}:18 \mathrm{km} \text{and} 35 \mathrm{g}:49 \mathrm{g}$

In the following proportion, find the value of $x$.

$2:x::4:6$