Home / 8,920.29-13,380.78-3,989.97

Finding the Fourth Proportional to 8,920.29, 13,380.78 and 3,989.97

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Solution

The fourth proportional to 8,920.29, 13,380.78 and 3,989.97 is: 5,985.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.29 : 13,380.78 = 3,989.97 : x
  2. Step 2: Convert to fraction form
    8,920.29/13,380.78 = 3,989.97/x
  3. Step 3: Cross multiply
    8,920.29x = 13,380.78 × 3,989.97
  4. Step 4: Simplify right side
    8,920.29x = 53,388,910.78
  5. Step 5: Solve for x
    x = 53,388,910.78/8,920.29
  6. Step 6: Final answer
    x = 5,985.11

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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.