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Finding the Fourth Proportional to 203.54, 280.86 and 129.90

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Solution

The fourth proportional to 203.54, 280.86 and 129.90 is: 179.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.54 : 280.86 = 129.90 : x
  2. Step 2: Convert to fraction form
    203.54/280.86 = 129.90/x
  3. Step 3: Cross multiply
    203.54x = 280.86 × 129.90
  4. Step 4: Simplify right side
    203.54x = 36,483.71
  5. Step 5: Solve for x
    x = 36,483.71/203.54
  6. Step 6: Final answer
    x = 179.25

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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.