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Finding the Fourth Proportional to 879.02, 1,318.17 and 391.73

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Solution

The fourth proportional to 879.02, 1,318.17 and 391.73 is: 587.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.02 : 1,318.17 = 391.73 : x
  2. Step 2: Convert to fraction form
    879.02/1,318.17 = 391.73/x
  3. Step 3: Cross multiply
    879.02x = 1,318.17 × 391.73
  4. Step 4: Simplify right side
    879.02x = 516,366.73
  5. Step 5: Solve for x
    x = 516,366.73/879.02
  6. Step 6: Final answer
    x = 587.43

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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.