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Finding the Third Proportional to 81.84 and 139.36

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Solution

The third proportional to 81.84 and 139.36 is: 237.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.84 : 139.36 = 139.36 : x
  2. Step 2: Convert to fraction form
    81.84/139.36 = 139.36/x
  3. Step 3: Cross multiply
    81.84x = 139.36 × 139.36
  4. Step 4: Simplify right side
    81.84x = 19,421.04
  5. Step 5: Solve for x
    x = 19,421.04/81.84
  6. Step 6: Final answer
    x = 237.29

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.