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Finding the Fourth Proportional to 640.89, 961.32 and 229.89

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Solution

The fourth proportional to 640.89, 961.32 and 229.89 is: 344.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.89 : 961.32 = 229.89 : x
  2. Step 2: Convert to fraction form
    640.89/961.32 = 229.89/x
  3. Step 3: Cross multiply
    640.89x = 961.32 × 229.89
  4. Step 4: Simplify right side
    640.89x = 220,997.85
  5. Step 5: Solve for x
    x = 220,997.85/640.89
  6. Step 6: Final answer
    x = 344.83

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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.