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Finding the Fourth Proportional to 641,105.30, 961,657.95 and 611,580.80

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Solution

The fourth proportional to 641,105.30, 961,657.95 and 611,580.80 is: 917,371.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,105.30 : 961,657.95 = 611,580.80 : x
  2. Step 2: Convert to fraction form
    641,105.30/961,657.95 = 611,580.80/x
  3. Step 3: Cross multiply
    641,105.30x = 961,657.95 × 611,580.80
  4. Step 4: Simplify right side
    641,105.30x = 588,131,538,387.36
  5. Step 5: Solve for x
    x = 588,131,538,387.36/641,105.30
  6. Step 6: Final answer
    x = 917,371.20

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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.