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Finding the Fourth Proportional to 621,352.71, 857,711.04 and 391,864.32

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Solution

The fourth proportional to 621,352.71, 857,711.04 and 391,864.32 is: 540,926.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,352.71 : 857,711.04 = 391,864.32 : x
  2. Step 2: Convert to fraction form
    621,352.71/857,711.04 = 391,864.32/x
  3. Step 3: Cross multiply
    621,352.71x = 857,711.04 × 391,864.32
  4. Step 4: Simplify right side
    621,352.71x = 336,106,353,446.09
  5. Step 5: Solve for x
    x = 336,106,353,446.09/621,352.71
  6. Step 6: Final answer
    x = 540,926.83

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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.