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Finding the Fourth Proportional to 221.10, 331.67 and 129.80

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Solution

The fourth proportional to 221.10, 331.67 and 129.80 is: 194.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.10 : 331.67 = 129.80 : x
  2. Step 2: Convert to fraction form
    221.10/331.67 = 129.80/x
  3. Step 3: Cross multiply
    221.10x = 331.67 × 129.80
  4. Step 4: Simplify right side
    221.10x = 43,050.77
  5. Step 5: Solve for x
    x = 43,050.77/221.10
  6. Step 6: Final answer
    x = 194.71

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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.