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Finding the Third Proportional to 86.25 and 103.13

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Solution

The third proportional to 86.25 and 103.13 is: 123.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.25 : 103.13 = 103.13 : x
  2. Step 2: Convert to fraction form
    86.25/103.13 = 103.13/x
  3. Step 3: Cross multiply
    86.25x = 103.13 × 103.13
  4. Step 4: Simplify right side
    86.25x = 10,634.77
  5. Step 5: Solve for x
    x = 10,634.77/86.25
  6. Step 6: Final answer
    x = 123.30

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.