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Finding the Fourth Proportional to 202.88, 280.11 and 129.23

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Solution

The fourth proportional to 202.88, 280.11 and 129.23 is: 178.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.88 : 280.11 = 129.23 : x
  2. Step 2: Convert to fraction form
    202.88/280.11 = 129.23/x
  3. Step 3: Cross multiply
    202.88x = 280.11 × 129.23
  4. Step 4: Simplify right side
    202.88x = 36,198.62
  5. Step 5: Solve for x
    x = 36,198.62/202.88
  6. Step 6: Final answer
    x = 178.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.