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Finding the Third Proportional to 128,820 and 261,279

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Solution

The third proportional to 128,820 and 261,279 is: 529,938.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,820 : 261,279 = 261,279 : x
  2. Step 2: Convert to fraction form
    128,820/261,279 = 261,279/x
  3. Step 3: Cross multiply
    128,820x = 261,279 × 261,279
  4. Step 4: Simplify right side
    128,820x = 68,266,715,841
  5. Step 5: Solve for x
    x = 68,266,715,841/128,820
  6. Step 6: Final answer
    x = 529,938.80

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.