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Finding the Fourth Proportional to 140.56, 211.11 and 120.31

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Solution

The fourth proportional to 140.56, 211.11 and 120.31 is: 180.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.56 : 211.11 = 120.31 : x
  2. Step 2: Convert to fraction form
    140.56/211.11 = 120.31/x
  3. Step 3: Cross multiply
    140.56x = 211.11 × 120.31
  4. Step 4: Simplify right side
    140.56x = 25,398.64
  5. Step 5: Solve for x
    x = 25,398.64/140.56
  6. Step 6: Final answer
    x = 180.70

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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.