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Finding the Fourth Proportional to 408,760.89, 613,163.19 and 128,300.01

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Solution

The fourth proportional to 408,760.89, 613,163.19 and 128,300.01 is: 192,456.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,760.89 : 613,163.19 = 128,300.01 : x
  2. Step 2: Convert to fraction form
    408,760.89/613,163.19 = 128,300.01/x
  3. Step 3: Cross multiply
    408,760.89x = 613,163.19 × 128,300.01
  4. Step 4: Simplify right side
    408,760.89x = 78,668,843,408.63
  5. Step 5: Solve for x
    x = 78,668,843,408.63/408,760.89
  6. Step 6: Final answer
    x = 192,456.87

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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.