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Finding the Fourth Proportional to 69.69, 104.40 and 55.11

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Solution

The fourth proportional to 69.69, 104.40 and 55.11 is: 82.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.69 : 104.40 = 55.11 : x
  2. Step 2: Convert to fraction form
    69.69/104.40 = 55.11/x
  3. Step 3: Cross multiply
    69.69x = 104.40 × 55.11
  4. Step 4: Simplify right side
    69.69x = 5,753.48
  5. Step 5: Solve for x
    x = 5,753.48/69.69
  6. Step 6: Final answer
    x = 82.56

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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.