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Finding the Fourth Proportional to 221.24, 331.58 and 129.90

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Solution

The fourth proportional to 221.24, 331.58 and 129.90 is: 194.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.24 : 331.58 = 129.90 : x
  2. Step 2: Convert to fraction form
    221.24/331.58 = 129.90/x
  3. Step 3: Cross multiply
    221.24x = 331.58 × 129.90
  4. Step 4: Simplify right side
    221.24x = 43,072.24
  5. Step 5: Solve for x
    x = 43,072.24/221.24
  6. Step 6: Final answer
    x = 194.69

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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.