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Finding the Fourth Proportional to 81.24, 121.44 and 60.76

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Solution

The fourth proportional to 81.24, 121.44 and 60.76 is: 90.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.24 : 121.44 = 60.76 : x
  2. Step 2: Convert to fraction form
    81.24/121.44 = 60.76/x
  3. Step 3: Cross multiply
    81.24x = 121.44 × 60.76
  4. Step 4: Simplify right side
    81.24x = 7,378.69
  5. Step 5: Solve for x
    x = 7,378.69/81.24
  6. Step 6: Final answer
    x = 90.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.