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Finding the Fourth Proportional to 67.06, 100.64 and 28.54

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Solution

The fourth proportional to 67.06, 100.64 and 28.54 is: 42.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.06 : 100.64 = 28.54 : x
  2. Step 2: Convert to fraction form
    67.06/100.64 = 28.54/x
  3. Step 3: Cross multiply
    67.06x = 100.64 × 28.54
  4. Step 4: Simplify right side
    67.06x = 2,872.27
  5. Step 5: Solve for x
    x = 2,872.27/67.06
  6. Step 6: Final answer
    x = 42.83

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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.