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Finding the Fourth Proportional to 866.41, 1,299.62 and 281.90

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Solution

The fourth proportional to 866.41, 1,299.62 and 281.90 is: 422.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.41 : 1,299.62 = 281.90 : x
  2. Step 2: Convert to fraction form
    866.41/1,299.62 = 281.90/x
  3. Step 3: Cross multiply
    866.41x = 1,299.62 × 281.90
  4. Step 4: Simplify right side
    866.41x = 366,362.88
  5. Step 5: Solve for x
    x = 366,362.88/866.41
  6. Step 6: Final answer
    x = 422.85

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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.