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Finding the Fourth Proportional to 623,991.86, 861,633.67 and 394,953.20

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Solution

The fourth proportional to 623,991.86, 861,633.67 and 394,953.20 is: 545,367.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    623,991.86 : 861,633.67 = 394,953.20 : x
  2. Step 2: Convert to fraction form
    623,991.86/861,633.67 = 394,953.20/x
  3. Step 3: Cross multiply
    623,991.86x = 861,633.67 × 394,953.20
  4. Step 4: Simplify right side
    623,991.86x = 340,304,975,194.24
  5. Step 5: Solve for x
    x = 340,304,975,194.24/623,991.86
  6. Step 6: Final answer
    x = 545,367.65

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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.