Home / 20,820.80-31,229.28-6,969.92

Finding the Fourth Proportional to 20,820.80, 31,229.28 and 6,969.92

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Solution

The fourth proportional to 20,820.80, 31,229.28 and 6,969.92 is: 10,454.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.80 : 31,229.28 = 6,969.92 : x
  2. Step 2: Convert to fraction form
    20,820.80/31,229.28 = 6,969.92/x
  3. Step 3: Cross multiply
    20,820.80x = 31,229.28 × 6,969.92
  4. Step 4: Simplify right side
    20,820.80x = 217,665,583.26
  5. Step 5: Solve for x
    x = 217,665,583.26/20,820.80
  6. Step 6: Final answer
    x = 10,454.24

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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.