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Finding the Fourth Proportional to 69.91, 104.50 and 54.71

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Solution

The fourth proportional to 69.91, 104.50 and 54.71 is: 81.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.91 : 104.50 = 54.71 : x
  2. Step 2: Convert to fraction form
    69.91/104.50 = 54.71/x
  3. Step 3: Cross multiply
    69.91x = 104.50 × 54.71
  4. Step 4: Simplify right side
    69.91x = 5,717.13
  5. Step 5: Solve for x
    x = 5,717.13/69.91
  6. Step 6: Final answer
    x = 81.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.