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Finding the Fourth Proportional to 878.92, 1,318.37 and 391.93

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Solution

The fourth proportional to 878.92, 1,318.37 and 391.93 is: 587.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.92 : 1,318.37 = 391.93 : x
  2. Step 2: Convert to fraction form
    878.92/1,318.37 = 391.93/x
  3. Step 3: Cross multiply
    878.92x = 1,318.37 × 391.93
  4. Step 4: Simplify right side
    878.92x = 516,708.75
  5. Step 5: Solve for x
    x = 516,708.75/878.92
  6. Step 6: Final answer
    x = 587.89

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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.