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Finding the Fourth Proportional to 140.02, 193.23 and 81.79

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Solution

The fourth proportional to 140.02, 193.23 and 81.79 is: 112.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.02 : 193.23 = 81.79 : x
  2. Step 2: Convert to fraction form
    140.02/193.23 = 81.79/x
  3. Step 3: Cross multiply
    140.02x = 193.23 × 81.79
  4. Step 4: Simplify right side
    140.02x = 15,804.28
  5. Step 5: Solve for x
    x = 15,804.28/140.02
  6. Step 6: Final answer
    x = 112.87

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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.