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Finding the Fourth Proportional to 142.20, 195.82 and 138.42

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Solution

The fourth proportional to 142.20, 195.82 and 138.42 is: 190.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.20 : 195.82 = 138.42 : x
  2. Step 2: Convert to fraction form
    142.20/195.82 = 138.42/x
  3. Step 3: Cross multiply
    142.20x = 195.82 × 138.42
  4. Step 4: Simplify right side
    142.20x = 27,105.06
  5. Step 5: Solve for x
    x = 27,105.06/142.20
  6. Step 6: Final answer
    x = 190.61

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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.