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Finding the Third Proportional to 72.75 and 91.31

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Solution

The third proportional to 72.75 and 91.31 is: 114.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.75 : 91.31 = 91.31 : x
  2. Step 2: Convert to fraction form
    72.75/91.31 = 91.31/x
  3. Step 3: Cross multiply
    72.75x = 91.31 × 91.31
  4. Step 4: Simplify right side
    72.75x = 8,337.97
  5. Step 5: Solve for x
    x = 8,337.97/72.75
  6. Step 6: Final answer
    x = 114.61

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Why These Related Problems?

These problems maintain the same ratio (1.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.