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Finding the Fourth Proportional to 8,920.80, 13,375.80 and 3,989.52

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Solution

The fourth proportional to 8,920.80, 13,375.80 and 3,989.52 is: 5,981.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.80 : 13,375.80 = 3,989.52 : x
  2. Step 2: Convert to fraction form
    8,920.80/13,375.80 = 3,989.52/x
  3. Step 3: Cross multiply
    8,920.80x = 13,375.80 × 3,989.52
  4. Step 4: Simplify right side
    8,920.80x = 53,363,021.62
  5. Step 5: Solve for x
    x = 53,363,021.62/8,920.80
  6. Step 6: Final answer
    x = 5,981.87

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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.