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Finding the Fourth Proportional to 430,711.65, 641,647.50 and 411,280.86

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Solution

The fourth proportional to 430,711.65, 641,647.50 and 411,280.86 is: 612,700.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,711.65 : 641,647.50 = 411,280.86 : x
  2. Step 2: Convert to fraction form
    430,711.65/641,647.50 = 411,280.86/x
  3. Step 3: Cross multiply
    430,711.65x = 641,647.50 × 411,280.86
  4. Step 4: Simplify right side
    430,711.65x = 263,897,335,616.85
  5. Step 5: Solve for x
    x = 263,897,335,616.85/430,711.65
  6. Step 6: Final answer
    x = 612,700.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.