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Finding the Fourth Proportional to 140.72, 211.10 and 68.56

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Solution

The fourth proportional to 140.72, 211.10 and 68.56 is: 102.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.72 : 211.10 = 68.56 : x
  2. Step 2: Convert to fraction form
    140.72/211.10 = 68.56/x
  3. Step 3: Cross multiply
    140.72x = 211.10 × 68.56
  4. Step 4: Simplify right side
    140.72x = 14,473.02
  5. Step 5: Solve for x
    x = 14,473.02/140.72
  6. Step 6: Final answer
    x = 102.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.