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Finding the Fourth Proportional to 66.67, 100 and 28.15

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Solution

The fourth proportional to 66.67, 100 and 28.15 is: 42.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.67 : 100 = 28.15 : x
  2. Step 2: Convert to fraction form
    66.67/100 = 28.15/x
  3. Step 3: Cross multiply
    66.67x = 100 × 28.15
  4. Step 4: Simplify right side
    66.67x = 2,815
  5. Step 5: Solve for x
    x = 2,815/66.67
  6. Step 6: Final answer
    x = 42.22

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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.