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Finding the Fourth Proportional to 639,866.76, 883,115.01 and 394,994.49

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Solution

The fourth proportional to 639,866.76, 883,115.01 and 394,994.49 is: 545,153.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,866.76 : 883,115.01 = 394,994.49 : x
  2. Step 2: Convert to fraction form
    639,866.76/883,115.01 = 394,994.49/x
  3. Step 3: Cross multiply
    639,866.76x = 883,115.01 × 394,994.49
  4. Step 4: Simplify right side
    639,866.76x = 348,825,562,986.30
  5. Step 5: Solve for x
    x = 348,825,562,986.30/639,866.76
  6. Step 6: Final answer
    x = 545,153.44

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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.