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Finding the Third Proportional to 128,590 and 263,436

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Solution

The third proportional to 128,590 and 263,436 is: 539,688.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,590 : 263,436 = 263,436 : x
  2. Step 2: Convert to fraction form
    128,590/263,436 = 263,436/x
  3. Step 3: Cross multiply
    128,590x = 263,436 × 263,436
  4. Step 4: Simplify right side
    128,590x = 69,398,526,096
  5. Step 5: Solve for x
    x = 69,398,526,096/128,590
  6. Step 6: Final answer
    x = 539,688.36

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.