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Finding the Third Proportional to 67,687 and 99,220

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Solution

The third proportional to 67,687 and 99,220 is: 145,443.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,687 : 99,220 = 99,220 : x
  2. Step 2: Convert to fraction form
    67,687/99,220 = 99,220/x
  3. Step 3: Cross multiply
    67,687x = 99,220 × 99,220
  4. Step 4: Simplify right side
    67,687x = 9,844,608,400
  5. Step 5: Solve for x
    x = 9,844,608,400/67,687
  6. Step 6: Final answer
    x = 145,443.12

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.