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Finding the Fourth Proportional to 81.44, 122.76 and 72.56

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Solution

The fourth proportional to 81.44, 122.76 and 72.56 is: 109.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.44 : 122.76 = 72.56 : x
  2. Step 2: Convert to fraction form
    81.44/122.76 = 72.56/x
  3. Step 3: Cross multiply
    81.44x = 122.76 × 72.56
  4. Step 4: Simplify right side
    81.44x = 8,907.47
  5. Step 5: Solve for x
    x = 8,907.47/81.44
  6. Step 6: Final answer
    x = 109.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.