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Finding the Fourth Proportional to 221.08, 332.25 and 129.79

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Solution

The fourth proportional to 221.08, 332.25 and 129.79 is: 195.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.08 : 332.25 = 129.79 : x
  2. Step 2: Convert to fraction form
    221.08/332.25 = 129.79/x
  3. Step 3: Cross multiply
    221.08x = 332.25 × 129.79
  4. Step 4: Simplify right side
    221.08x = 43,122.73
  5. Step 5: Solve for x
    x = 43,122.73/221.08
  6. Step 6: Final answer
    x = 195.05

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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.