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Finding the Fourth Proportional to 203.36, 280.56 and 129.68

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Solution

The fourth proportional to 203.36, 280.56 and 129.68 is: 178.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.36 : 280.56 = 129.68 : x
  2. Step 2: Convert to fraction form
    203.36/280.56 = 129.68/x
  3. Step 3: Cross multiply
    203.36x = 280.56 × 129.68
  4. Step 4: Simplify right side
    203.36x = 36,383.02
  5. Step 5: Solve for x
    x = 36,383.02/203.36
  6. Step 6: Final answer
    x = 178.91

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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.