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Finding the Fourth Proportional to 203.11, 304.53 and 81.22

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Solution

The fourth proportional to 203.11, 304.53 and 81.22 is: 121.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.11 : 304.53 = 81.22 : x
  2. Step 2: Convert to fraction form
    203.11/304.53 = 81.22/x
  3. Step 3: Cross multiply
    203.11x = 304.53 × 81.22
  4. Step 4: Simplify right side
    203.11x = 24,733.93
  5. Step 5: Solve for x
    x = 24,733.93/203.11
  6. Step 6: Final answer
    x = 121.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.