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Finding the Fourth Proportional to 142.57, 197.58 and 140.61

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Solution

The fourth proportional to 142.57, 197.58 and 140.61 is: 194.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.57 : 197.58 = 140.61 : x
  2. Step 2: Convert to fraction form
    142.57/197.58 = 140.61/x
  3. Step 3: Cross multiply
    142.57x = 197.58 × 140.61
  4. Step 4: Simplify right side
    142.57x = 27,781.72
  5. Step 5: Solve for x
    x = 27,781.72/142.57
  6. Step 6: Final answer
    x = 194.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.