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Finding the Fourth Proportional to 715,856.13, 987,856.05 and 393,563.71

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Solution

The fourth proportional to 715,856.13, 987,856.05 and 393,563.71 is: 543,103.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,856.13 : 987,856.05 = 393,563.71 : x
  2. Step 2: Convert to fraction form
    715,856.13/987,856.05 = 393,563.71/x
  3. Step 3: Cross multiply
    715,856.13x = 987,856.05 × 393,563.71
  4. Step 4: Simplify right side
    715,856.13x = 388,784,294,694.63
  5. Step 5: Solve for x
    x = 388,784,294,694.63/715,856.13
  6. Step 6: Final answer
    x = 543,103.95

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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.