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Finding the Third Proportional to 61 and 68.75

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Solution

The third proportional to 61 and 68.75 is: 77.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    61 : 68.75 = 68.75 : x
  2. Step 2: Convert to fraction form
    61/68.75 = 68.75/x
  3. Step 3: Cross multiply
    61x = 68.75 × 68.75
  4. Step 4: Simplify right side
    61x = 4,726.56
  5. Step 5: Solve for x
    x = 4,726.56/61
  6. Step 6: Final answer
    x = 77.48

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Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.