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Finding the Fourth Proportional to 81.41, 122.31 and 77.31

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Solution

The fourth proportional to 81.41, 122.31 and 77.31 is: 116.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.41 : 122.31 = 77.31 : x
  2. Step 2: Convert to fraction form
    81.41/122.31 = 77.31/x
  3. Step 3: Cross multiply
    81.41x = 122.31 × 77.31
  4. Step 4: Simplify right side
    81.41x = 9,455.79
  5. Step 5: Solve for x
    x = 9,455.79/81.41
  6. Step 6: Final answer
    x = 116.16

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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.