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Finding the Fourth Proportional to 801.14, 1,201.50 and 281.12

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Solution

The fourth proportional to 801.14, 1,201.50 and 281.12 is: 421.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.14 : 1,201.50 = 281.12 : x
  2. Step 2: Convert to fraction form
    801.14/1,201.50 = 281.12/x
  3. Step 3: Cross multiply
    801.14x = 1,201.50 × 281.12
  4. Step 4: Simplify right side
    801.14x = 337,765.68
  5. Step 5: Solve for x
    x = 337,765.68/801.14
  6. Step 6: Final answer
    x = 421.61

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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.