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Finding the Fourth Proportional to 866.72, 1,299.30 and 318.52

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Solution

The fourth proportional to 866.72, 1,299.30 and 318.52 is: 477.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.72 : 1,299.30 = 318.52 : x
  2. Step 2: Convert to fraction form
    866.72/1,299.30 = 318.52/x
  3. Step 3: Cross multiply
    866.72x = 1,299.30 × 318.52
  4. Step 4: Simplify right side
    866.72x = 413,853.04
  5. Step 5: Solve for x
    x = 413,853.04/866.72
  6. Step 6: Final answer
    x = 477.49

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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.