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Finding the Fourth Proportional to 257,811.85, 386,625.13 and 89,286.79

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Solution

The fourth proportional to 257,811.85, 386,625.13 and 89,286.79 is: 133,898.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,811.85 : 386,625.13 = 89,286.79 : x
  2. Step 2: Convert to fraction form
    257,811.85/386,625.13 = 89,286.79/x
  3. Step 3: Cross multiply
    257,811.85x = 386,625.13 × 89,286.79
  4. Step 4: Simplify right side
    257,811.85x = 34,520,516,791.03
  5. Step 5: Solve for x
    x = 34,520,516,791.03/257,811.85
  6. Step 6: Final answer
    x = 133,898.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.