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Finding the Third Proportional to 66.56 and 140.96

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Solution

The third proportional to 66.56 and 140.96 is: 298.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.56 : 140.96 = 140.96 : x
  2. Step 2: Convert to fraction form
    66.56/140.96 = 140.96/x
  3. Step 3: Cross multiply
    66.56x = 140.96 × 140.96
  4. Step 4: Simplify right side
    66.56x = 19,869.44
  5. Step 5: Solve for x
    x = 19,869.44/66.56
  6. Step 6: Final answer
    x = 298.50

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.