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Finding the Fourth Proportional to 81.24, 121.95 and 50.73

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Solution

The fourth proportional to 81.24, 121.95 and 50.73 is: 76.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.24 : 121.95 = 50.73 : x
  2. Step 2: Convert to fraction form
    81.24/121.95 = 50.73/x
  3. Step 3: Cross multiply
    81.24x = 121.95 × 50.73
  4. Step 4: Simplify right side
    81.24x = 6,186.52
  5. Step 5: Solve for x
    x = 6,186.52/81.24
  6. Step 6: Final answer
    x = 76.15

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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.