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Finding the Fourth Proportional to 801.39, 1,201.94 and 281.27

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Solution

The fourth proportional to 801.39, 1,201.94 and 281.27 is: 421.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.39 : 1,201.94 = 281.27 : x
  2. Step 2: Convert to fraction form
    801.39/1,201.94 = 281.27/x
  3. Step 3: Cross multiply
    801.39x = 1,201.94 × 281.27
  4. Step 4: Simplify right side
    801.39x = 338,072.32
  5. Step 5: Solve for x
    x = 338,072.32/801.39
  6. Step 6: Final answer
    x = 421.86

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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.