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Finding the Fourth Proportional to 203.61, 305.19 and 81.73

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Solution

The fourth proportional to 203.61, 305.19 and 81.73 is: 122.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.61 : 305.19 = 81.73 : x
  2. Step 2: Convert to fraction form
    203.61/305.19 = 81.73/x
  3. Step 3: Cross multiply
    203.61x = 305.19 × 81.73
  4. Step 4: Simplify right side
    203.61x = 24,943.18
  5. Step 5: Solve for x
    x = 24,943.18/203.61
  6. Step 6: Final answer
    x = 122.50

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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.