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Finding the Fourth Proportional to 140.54, 193.92 and 80.72

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Solution

The fourth proportional to 140.54, 193.92 and 80.72 is: 111.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.54 : 193.92 = 80.72 : x
  2. Step 2: Convert to fraction form
    140.54/193.92 = 80.72/x
  3. Step 3: Cross multiply
    140.54x = 193.92 × 80.72
  4. Step 4: Simplify right side
    140.54x = 15,652.25
  5. Step 5: Solve for x
    x = 15,652.25/140.54
  6. Step 6: Final answer
    x = 111.38

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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.