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Finding the Fourth Proportional to 129, 193.28 and 80.80

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Solution

The fourth proportional to 129, 193.28 and 80.80 is: 121.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 193.28 = 80.80 : x
  2. Step 2: Convert to fraction form
    129/193.28 = 80.80/x
  3. Step 3: Cross multiply
    129x = 193.28 × 80.80
  4. Step 4: Simplify right side
    129x = 15,617.02
  5. Step 5: Solve for x
    x = 15,617.02/129
  6. Step 6: Final answer
    x = 121.06

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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.