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Finding the Third Proportional to 103,623 and 128,561

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Solution

The third proportional to 103,623 and 128,561 is: 159,500.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,623 : 128,561 = 128,561 : x
  2. Step 2: Convert to fraction form
    103,623/128,561 = 128,561/x
  3. Step 3: Cross multiply
    103,623x = 128,561 × 128,561
  4. Step 4: Simplify right side
    103,623x = 16,527,930,721
  5. Step 5: Solve for x
    x = 16,527,930,721/103,623
  6. Step 6: Final answer
    x = 159,500.60

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Why These Related Problems?

These problems maintain the same ratio (1.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.