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Finding the Fourth Proportional to 1,229.40, 1,843.80 and 363.78

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Solution

The fourth proportional to 1,229.40, 1,843.80 and 363.78 is: 545.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.40 : 1,843.80 = 363.78 : x
  2. Step 2: Convert to fraction form
    1,229.40/1,843.80 = 363.78/x
  3. Step 3: Cross multiply
    1,229.40x = 1,843.80 × 363.78
  4. Step 4: Simplify right side
    1,229.40x = 670,737.56
  5. Step 5: Solve for x
    x = 670,737.56/1,229.40
  6. Step 6: Final answer
    x = 545.58

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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.