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Finding the Fourth Proportional to 77.76, 107.22 and 59.38

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Solution

The fourth proportional to 77.76, 107.22 and 59.38 is: 81.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.76 : 107.22 = 59.38 : x
  2. Step 2: Convert to fraction form
    77.76/107.22 = 59.38/x
  3. Step 3: Cross multiply
    77.76x = 107.22 × 59.38
  4. Step 4: Simplify right side
    77.76x = 6,367.28
  5. Step 5: Solve for x
    x = 6,367.28/77.76
  6. Step 6: Final answer
    x = 81.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.