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Finding the Fourth Proportional to 67.09, 100.59 and 28.60

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Solution

The fourth proportional to 67.09, 100.59 and 28.60 is: 42.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.09 : 100.59 = 28.60 : x
  2. Step 2: Convert to fraction form
    67.09/100.59 = 28.60/x
  3. Step 3: Cross multiply
    67.09x = 100.59 × 28.60
  4. Step 4: Simplify right side
    67.09x = 2,876.87
  5. Step 5: Solve for x
    x = 2,876.87/67.09
  6. Step 6: Final answer
    x = 42.88

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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.