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Finding the Fourth Proportional to 663,992.39, 916,282.98 and 392,147.88

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Solution

The fourth proportional to 663,992.39, 916,282.98 and 392,147.88 is: 541,148.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,992.39 : 916,282.98 = 392,147.88 : x
  2. Step 2: Convert to fraction form
    663,992.39/916,282.98 = 392,147.88/x
  3. Step 3: Cross multiply
    663,992.39x = 916,282.98 × 392,147.88
  4. Step 4: Simplify right side
    663,992.39x = 359,318,428,087.08
  5. Step 5: Solve for x
    x = 359,318,428,087.08/663,992.39
  6. Step 6: Final answer
    x = 541,148.42

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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.