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Finding the Fourth Proportional to 81.79, 122.89 and 76.93

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Solution

The fourth proportional to 81.79, 122.89 and 76.93 is: 115.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.79 : 122.89 = 76.93 : x
  2. Step 2: Convert to fraction form
    81.79/122.89 = 76.93/x
  3. Step 3: Cross multiply
    81.79x = 122.89 × 76.93
  4. Step 4: Simplify right side
    81.79x = 9,452.93
  5. Step 5: Solve for x
    x = 9,452.93/81.79
  6. Step 6: Final answer
    x = 115.58

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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.