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Finding the Third Proportional to 99.75 and 139.13

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Solution

The third proportional to 99.75 and 139.13 is: 194.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.75 : 139.13 = 139.13 : x
  2. Step 2: Convert to fraction form
    99.75/139.13 = 139.13/x
  3. Step 3: Cross multiply
    99.75x = 139.13 × 139.13
  4. Step 4: Simplify right side
    99.75x = 19,355.77
  5. Step 5: Solve for x
    x = 19,355.77/99.75
  6. Step 6: Final answer
    x = 194.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.