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Finding the Fourth Proportional to 641,715.40, 961,406.70 and 392,105.80

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Solution

The fourth proportional to 641,715.40, 961,406.70 and 392,105.80 is: 587,446.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,715.40 : 961,406.70 = 392,105.80 : x
  2. Step 2: Convert to fraction form
    641,715.40/961,406.70 = 392,105.80/x
  3. Step 3: Cross multiply
    641,715.40x = 961,406.70 × 392,105.80
  4. Step 4: Simplify right side
    641,715.40x = 376,973,143,228.86
  5. Step 5: Solve for x
    x = 376,973,143,228.86/641,715.40
  6. Step 6: Final answer
    x = 587,446.00

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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.