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Finding the Fourth Proportional to 866.27, 1,299.91 and 318.83

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Solution

The fourth proportional to 866.27, 1,299.91 and 318.83 is: 478.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.27 : 1,299.91 = 318.83 : x
  2. Step 2: Convert to fraction form
    866.27/1,299.91 = 318.83/x
  3. Step 3: Cross multiply
    866.27x = 1,299.91 × 318.83
  4. Step 4: Simplify right side
    866.27x = 414,455.92
  5. Step 5: Solve for x
    x = 414,455.92/866.27
  6. Step 6: Final answer
    x = 478.44

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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.