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Finding the Fourth Proportional to 101.82, 140.65 and 81.24

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Solution

The fourth proportional to 101.82, 140.65 and 81.24 is: 112.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.82 : 140.65 = 81.24 : x
  2. Step 2: Convert to fraction form
    101.82/140.65 = 81.24/x
  3. Step 3: Cross multiply
    101.82x = 140.65 × 81.24
  4. Step 4: Simplify right side
    101.82x = 11,426.41
  5. Step 5: Solve for x
    x = 11,426.41/101.82
  6. Step 6: Final answer
    x = 112.22

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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.