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Finding the Third Proportional to 61.22 and 129.57

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Solution

The third proportional to 61.22 and 129.57 is: 274.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.22 : 129.57 = 129.57 : x
  2. Step 2: Convert to fraction form
    61.22/129.57 = 129.57/x
  3. Step 3: Cross multiply
    61.22x = 129.57 × 129.57
  4. Step 4: Simplify right side
    61.22x = 16,787.96
  5. Step 5: Solve for x
    x = 16,787.96/61.22
  6. Step 6: Final answer
    x = 274.20

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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.