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Finding the Fourth Proportional to 140.13, 193.31 and 81.88

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Solution

The fourth proportional to 140.13, 193.31 and 81.88 is: 112.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.13 : 193.31 = 81.88 : x
  2. Step 2: Convert to fraction form
    140.13/193.31 = 81.88/x
  3. Step 3: Cross multiply
    140.13x = 193.31 × 81.88
  4. Step 4: Simplify right side
    140.13x = 15,828.22
  5. Step 5: Solve for x
    x = 15,828.22/140.13
  6. Step 6: Final answer
    x = 112.95

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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.