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Finding the Fourth Proportional to 142.24, 211.68 and 140.73

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Solution

The fourth proportional to 142.24, 211.68 and 140.73 is: 209.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.24 : 211.68 = 140.73 : x
  2. Step 2: Convert to fraction form
    142.24/211.68 = 140.73/x
  3. Step 3: Cross multiply
    142.24x = 211.68 × 140.73
  4. Step 4: Simplify right side
    142.24x = 29,789.73
  5. Step 5: Solve for x
    x = 29,789.73/142.24
  6. Step 6: Final answer
    x = 209.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.