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Finding the Fourth Proportional to 623,992.86, 861,635.05 and 394,954.20

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Solution

The fourth proportional to 623,992.86, 861,635.05 and 394,954.20 is: 545,369.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    623,992.86 : 861,635.05 = 394,954.20 : x
  2. Step 2: Convert to fraction form
    623,992.86/861,635.05 = 394,954.20/x
  3. Step 3: Cross multiply
    623,992.86x = 861,635.05 × 394,954.20
  4. Step 4: Simplify right side
    623,992.86x = 340,306,381,864.71
  5. Step 5: Solve for x
    x = 340,306,381,864.71/623,992.86
  6. Step 6: Final answer
    x = 545,369.03

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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.