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Finding the Fourth Proportional to 866.16, 1,299.33 and 318.35

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Solution

The fourth proportional to 866.16, 1,299.33 and 318.35 is: 477.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.16 : 1,299.33 = 318.35 : x
  2. Step 2: Convert to fraction form
    866.16/1,299.33 = 318.35/x
  3. Step 3: Cross multiply
    866.16x = 1,299.33 × 318.35
  4. Step 4: Simplify right side
    866.16x = 413,644.95
  5. Step 5: Solve for x
    x = 413,644.95/866.16
  6. Step 6: Final answer
    x = 477.56

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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.