Home / 28.24-42.36-20.20

Finding the Fourth Proportional to 28.24, 42.36 and 20.20

Calculator

Solution

The fourth proportional to 28.24, 42.36 and 20.20 is: 30.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.24 : 42.36 = 20.20 : x
  2. Step 2: Convert to fraction form
    28.24/42.36 = 20.20/x
  3. Step 3: Cross multiply
    28.24x = 42.36 × 20.20
  4. Step 4: Simplify right side
    28.24x = 855.67
  5. Step 5: Solve for x
    x = 855.67/28.24
  6. Step 6: Final answer
    x = 30.30

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.