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Finding the Fourth Proportional to 866.61, 1,299.65 and 318.69

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Solution

The fourth proportional to 866.61, 1,299.65 and 318.69 is: 477.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.61 : 1,299.65 = 318.69 : x
  2. Step 2: Convert to fraction form
    866.61/1,299.65 = 318.69/x
  3. Step 3: Cross multiply
    866.61x = 1,299.65 × 318.69
  4. Step 4: Simplify right side
    866.61x = 414,183.87
  5. Step 5: Solve for x
    x = 414,183.87/866.61
  6. Step 6: Final answer
    x = 477.94

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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.