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Finding the Fourth Proportional to 640.67, 961.11 and 229.77

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Solution

The fourth proportional to 640.67, 961.11 and 229.77 is: 344.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.67 : 961.11 = 229.77 : x
  2. Step 2: Convert to fraction form
    640.67/961.11 = 229.77/x
  3. Step 3: Cross multiply
    640.67x = 961.11 × 229.77
  4. Step 4: Simplify right side
    640.67x = 220,834.24
  5. Step 5: Solve for x
    x = 220,834.24/640.67
  6. Step 6: Final answer
    x = 344.70

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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.