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Finding the Fourth Proportional to 801.88, 1,201.18 and 389.78

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Solution

The fourth proportional to 801.88, 1,201.18 and 389.78 is: 583.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.88 : 1,201.18 = 389.78 : x
  2. Step 2: Convert to fraction form
    801.88/1,201.18 = 389.78/x
  3. Step 3: Cross multiply
    801.88x = 1,201.18 × 389.78
  4. Step 4: Simplify right side
    801.88x = 468,195.94
  5. Step 5: Solve for x
    x = 468,195.94/801.88
  6. Step 6: Final answer
    x = 583.87

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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.