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Finding the Fourth Proportional to 878.86, 1,318.31 and 330.91

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Solution

The fourth proportional to 878.86, 1,318.31 and 330.91 is: 496.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.86 : 1,318.31 = 330.91 : x
  2. Step 2: Convert to fraction form
    878.86/1,318.31 = 330.91/x
  3. Step 3: Cross multiply
    878.86x = 1,318.31 × 330.91
  4. Step 4: Simplify right side
    878.86x = 436,241.96
  5. Step 5: Solve for x
    x = 436,241.96/878.86
  6. Step 6: Final answer
    x = 496.37

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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.