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Finding the Fourth Proportional to 203.92, 280.87 and 154.72

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Solution

The fourth proportional to 203.92, 280.87 and 154.72 is: 213.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.92 : 280.87 = 154.72 : x
  2. Step 2: Convert to fraction form
    203.92/280.87 = 154.72/x
  3. Step 3: Cross multiply
    203.92x = 280.87 × 154.72
  4. Step 4: Simplify right side
    203.92x = 43,456.21
  5. Step 5: Solve for x
    x = 43,456.21/203.92
  6. Step 6: Final answer
    x = 213.10

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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.