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Finding the Fourth Proportional to 203.05, 280.34 and 128.44

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Solution

The fourth proportional to 203.05, 280.34 and 128.44 is: 177.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.05 : 280.34 = 128.44 : x
  2. Step 2: Convert to fraction form
    203.05/280.34 = 128.44/x
  3. Step 3: Cross multiply
    203.05x = 280.34 × 128.44
  4. Step 4: Simplify right side
    203.05x = 36,006.87
  5. Step 5: Solve for x
    x = 36,006.87/203.05
  6. Step 6: Final answer
    x = 177.33

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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.