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Finding the Third Proportional to 128,776 and 278,990

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Solution

The third proportional to 128,776 and 278,990 is: 604,424.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,776 : 278,990 = 278,990 : x
  2. Step 2: Convert to fraction form
    128,776/278,990 = 278,990/x
  3. Step 3: Cross multiply
    128,776x = 278,990 × 278,990
  4. Step 4: Simplify right side
    128,776x = 77,835,420,100
  5. Step 5: Solve for x
    x = 77,835,420,100/128,776
  6. Step 6: Final answer
    x = 604,424.89

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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.