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Finding the Third Proportional to 63.28 and 139.85

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Solution

The third proportional to 63.28 and 139.85 is: 309.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.28 : 139.85 = 139.85 : x
  2. Step 2: Convert to fraction form
    63.28/139.85 = 139.85/x
  3. Step 3: Cross multiply
    63.28x = 139.85 × 139.85
  4. Step 4: Simplify right side
    63.28x = 19,558.46
  5. Step 5: Solve for x
    x = 19,558.46/63.28
  6. Step 6: Final answer
    x = 309.07

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.