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Finding the Fourth Proportional to 715,833.48, 987,856.91 and 393,545.88

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Solution

The fourth proportional to 715,833.48, 987,856.91 and 393,545.88 is: 543,097.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,833.48 : 987,856.91 = 393,545.88 : x
  2. Step 2: Convert to fraction form
    715,833.48/987,856.91 = 393,545.88/x
  3. Step 3: Cross multiply
    715,833.48x = 987,856.91 × 393,545.88
  4. Step 4: Simplify right side
    715,833.48x = 388,767,018,139.60
  5. Step 5: Solve for x
    x = 388,767,018,139.60/715,833.48
  6. Step 6: Final answer
    x = 543,097.00

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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.