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Finding the Fourth Proportional to 621,605.78, 857,951.81 and 395,207.06

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Solution

The fourth proportional to 621,605.78, 857,951.81 and 395,207.06 is: 545,472.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,605.78 : 857,951.81 = 395,207.06 : x
  2. Step 2: Convert to fraction form
    621,605.78/857,951.81 = 395,207.06/x
  3. Step 3: Cross multiply
    621,605.78x = 857,951.81 × 395,207.06
  4. Step 4: Simplify right side
    621,605.78x = 339,068,612,451.78
  5. Step 5: Solve for x
    x = 339,068,612,451.78/621,605.78
  6. Step 6: Final answer
    x = 545,472.10

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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.