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Finding the Fourth Proportional to 142.88, 197.15 and 80.69

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Solution

The fourth proportional to 142.88, 197.15 and 80.69 is: 111.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.88 : 197.15 = 80.69 : x
  2. Step 2: Convert to fraction form
    142.88/197.15 = 80.69/x
  3. Step 3: Cross multiply
    142.88x = 197.15 × 80.69
  4. Step 4: Simplify right side
    142.88x = 15,906.64
  5. Step 5: Solve for x
    x = 15,906.64/142.88
  6. Step 6: Final answer
    x = 111.33

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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.