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Finding the Third Proportional to 61.75 and 71

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Solution

The third proportional to 61.75 and 71 is: 81.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.75 : 71 = 71 : x
  2. Step 2: Convert to fraction form
    61.75/71 = 71/x
  3. Step 3: Cross multiply
    61.75x = 71 × 71
  4. Step 4: Simplify right side
    61.75x = 5,041
  5. Step 5: Solve for x
    x = 5,041/61.75
  6. Step 6: Final answer
    x = 81.64

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.