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Finding the Fourth Proportional to 99,440, 137,229.36 and 54,728

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Solution

The fourth proportional to 99,440, 137,229.36 and 54,728 is: 75,525.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,440 : 137,229.36 = 54,728 : x
  2. Step 2: Convert to fraction form
    99,440/137,229.36 = 54,728/x
  3. Step 3: Cross multiply
    99,440x = 137,229.36 × 54,728
  4. Step 4: Simplify right side
    99,440x = 7,510,288,414.08
  5. Step 5: Solve for x
    x = 7,510,288,414.08/99,440
  6. Step 6: Final answer
    x = 75,525.83

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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.