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Finding the Third Proportional to 257,587 and 378,930

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Solution

The third proportional to 257,587 and 378,930 is: 557,434.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,587 : 378,930 = 378,930 : x
  2. Step 2: Convert to fraction form
    257,587/378,930 = 378,930/x
  3. Step 3: Cross multiply
    257,587x = 378,930 × 378,930
  4. Step 4: Simplify right side
    257,587x = 143,587,944,900
  5. Step 5: Solve for x
    x = 143,587,944,900/257,587
  6. Step 6: Final answer
    x = 557,434.75

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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.