# Find the perimeter of a quadrilateral if its sides are proportional to the numbers 3,4,5 and 8

**Find the perimeter of a quadrilateral if its sides are proportional to the numbers 3,4,5 and 8, and the largest side is 10.5 cm larger than the smallest.**

1) Determine how much larger the number of the larger side is than the number of the smaller side of the quadrangle in the ratio of the sides of the quadrilateral.

8 – 3 = 5.

2) How many centimeters are there in one piece?

10.5 / 5 = 2.1 centimeters.

3) What is one side of the quadrangle equal to?

2.1 * 3 = 6.3 centimeters.

4) What is the other side equal to?

2.1 * 4 = 8.4 centimeters.

5) What is the third party equal to?

2.1 * 5 = 10.5 centimeters.

6) What is the fourth side equal to?

2.1 * 8 = 16.8 centimeters.

7) Find the perimeter.

6.3 + 8.4 + 10.5 + 16.8 = 42 centimeters.

Answer: The perimeter is 42 centimeters.