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Finding the Fourth Proportional to 443,709.12, 665,563.70 and 405,217.92

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Solution

The fourth proportional to 443,709.12, 665,563.70 and 405,217.92 is: 607,826.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,709.12 : 665,563.70 = 405,217.92 : x
  2. Step 2: Convert to fraction form
    443,709.12/665,563.70 = 405,217.92/x
  3. Step 3: Cross multiply
    443,709.12x = 665,563.70 × 405,217.92
  4. Step 4: Simplify right side
    443,709.12x = 269,698,338,141.50
  5. Step 5: Solve for x
    x = 269,698,338,141.50/443,709.12
  6. Step 6: Final answer
    x = 607,826.90

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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.