Final answer:
To find the length and breadth of a rectangle in the ratio 4:3, set up a proportion and solve for x. Use the value of x to find the actual length and breadth of the rectangle.
Step-by-step explanation:
To find the length and breadth of a rectangle in the ratio 4:3, we can set up two proportions. Let's say the length of the rectangle is 4x and the breadth is 3x. Since the perimeter is given as 154 cm, we can write the equation 2(4x + 3x) = 154. Solving this equation will give us the values of x, which we can then use to find the length and breadth of the rectangle.