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Finding the Third Proportional to 87,703 and 128,278

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Solution

The third proportional to 87,703 and 128,278 is: 187,624.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,703 : 128,278 = 128,278 : x
  2. Step 2: Convert to fraction form
    87,703/128,278 = 128,278/x
  3. Step 3: Cross multiply
    87,703x = 128,278 × 128,278
  4. Step 4: Simplify right side
    87,703x = 16,455,245,284
  5. Step 5: Solve for x
    x = 16,455,245,284/87,703
  6. Step 6: Final answer
    x = 187,624.66

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.