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Finding the Fourth Proportional to 641,564.40, 885,298.89 and 383,390.11

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Solution

The fourth proportional to 641,564.40, 885,298.89 and 383,390.11 is: 529,042.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,564.40 : 885,298.89 = 383,390.11 : x
  2. Step 2: Convert to fraction form
    641,564.40/885,298.89 = 383,390.11/x
  3. Step 3: Cross multiply
    641,564.40x = 885,298.89 × 383,390.11
  4. Step 4: Simplify right side
    641,564.40x = 339,414,836,606.73
  5. Step 5: Solve for x
    x = 339,414,836,606.73/641,564.40
  6. Step 6: Final answer
    x = 529,042.50

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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.