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Finding the Fourth Proportional to 101.67, 140.40 and 81.09

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Solution

The fourth proportional to 101.67, 140.40 and 81.09 is: 111.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.67 : 140.40 = 81.09 : x
  2. Step 2: Convert to fraction form
    101.67/140.40 = 81.09/x
  3. Step 3: Cross multiply
    101.67x = 140.40 × 81.09
  4. Step 4: Simplify right side
    101.67x = 11,385.04
  5. Step 5: Solve for x
    x = 11,385.04/101.67
  6. Step 6: Final answer
    x = 111.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.