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Finding the Fourth Proportional to 66.80, 100.12 and 28.27

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Solution

The fourth proportional to 66.80, 100.12 and 28.27 is: 42.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.80 : 100.12 = 28.27 : x
  2. Step 2: Convert to fraction form
    66.80/100.12 = 28.27/x
  3. Step 3: Cross multiply
    66.80x = 100.12 × 28.27
  4. Step 4: Simplify right side
    66.80x = 2,830.21
  5. Step 5: Solve for x
    x = 2,830.21/66.80
  6. Step 6: Final answer
    x = 42.37

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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.