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Finding the Fourth Proportional to 203.15, 280.31 and 129.37

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Solution

The fourth proportional to 203.15, 280.31 and 129.37 is: 178.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.15 : 280.31 = 129.37 : x
  2. Step 2: Convert to fraction form
    203.15/280.31 = 129.37/x
  3. Step 3: Cross multiply
    203.15x = 280.31 × 129.37
  4. Step 4: Simplify right side
    203.15x = 36,262.36
  5. Step 5: Solve for x
    x = 36,262.36/203.15
  6. Step 6: Final answer
    x = 178.50

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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.