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Finding the Third Proportional to 128,721 and 278,886

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Solution

The third proportional to 128,721 and 278,886 is: 604,232.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,721 : 278,886 = 278,886 : x
  2. Step 2: Convert to fraction form
    128,721/278,886 = 278,886/x
  3. Step 3: Cross multiply
    128,721x = 278,886 × 278,886
  4. Step 4: Simplify right side
    128,721x = 77,777,400,996
  5. Step 5: Solve for x
    x = 77,777,400,996/128,721
  6. Step 6: Final answer
    x = 604,232.42

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.