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Finding the Fourth Proportional to 221.10, 332.19 and 129.84

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Solution

The fourth proportional to 221.10, 332.19 and 129.84 is: 195.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.10 : 332.19 = 129.84 : x
  2. Step 2: Convert to fraction form
    221.10/332.19 = 129.84/x
  3. Step 3: Cross multiply
    221.10x = 332.19 × 129.84
  4. Step 4: Simplify right side
    221.10x = 43,131.55
  5. Step 5: Solve for x
    x = 43,131.55/221.10
  6. Step 6: Final answer
    x = 195.08

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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.