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Finding the Fourth Proportional to 381,025.80, 571,181.10 and 128,129.46

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Solution

The fourth proportional to 381,025.80, 571,181.10 and 128,129.46 is: 192,073.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,025.80 : 571,181.10 = 128,129.46 : x
  2. Step 2: Convert to fraction form
    381,025.80/571,181.10 = 128,129.46/x
  3. Step 3: Cross multiply
    381,025.80x = 571,181.10 × 128,129.46
  4. Step 4: Simplify right side
    381,025.80x = 73,185,125,905.21
  5. Step 5: Solve for x
    x = 73,185,125,905.21/381,025.80
  6. Step 6: Final answer
    x = 192,073.94

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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.