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Finding the Fourth Proportional to 102.91, 154.43 and 54.85

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Solution

The fourth proportional to 102.91, 154.43 and 54.85 is: 82.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.91 : 154.43 = 54.85 : x
  2. Step 2: Convert to fraction form
    102.91/154.43 = 54.85/x
  3. Step 3: Cross multiply
    102.91x = 154.43 × 54.85
  4. Step 4: Simplify right side
    102.91x = 8,469.44
  5. Step 5: Solve for x
    x = 8,469.44/102.91
  6. Step 6: Final answer
    x = 82.30

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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.