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Finding the Fourth Proportional to 7,072.92, 9,761.22 and 3,929.40

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Solution

The fourth proportional to 7,072.92, 9,761.22 and 3,929.40 is: 5,422.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,072.92 : 9,761.22 = 3,929.40 : x
  2. Step 2: Convert to fraction form
    7,072.92/9,761.22 = 3,929.40/x
  3. Step 3: Cross multiply
    7,072.92x = 9,761.22 × 3,929.40
  4. Step 4: Simplify right side
    7,072.92x = 38,355,737.87
  5. Step 5: Solve for x
    x = 38,355,737.87/7,072.92
  6. Step 6: Final answer
    x = 5,422.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.