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Finding the Third Proportional to 81.25 and 88.50

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Solution

The third proportional to 81.25 and 88.50 is: 96.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.25 : 88.50 = 88.50 : x
  2. Step 2: Convert to fraction form
    81.25/88.50 = 88.50/x
  3. Step 3: Cross multiply
    81.25x = 88.50 × 88.50
  4. Step 4: Simplify right side
    81.25x = 7,832.25
  5. Step 5: Solve for x
    x = 7,832.25/81.25
  6. Step 6: Final answer
    x = 96.40

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.