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Finding the Third Proportional to 128,426 and 279,100

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Solution

The third proportional to 128,426 and 279,100 is: 606,550.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,426 : 279,100 = 279,100 : x
  2. Step 2: Convert to fraction form
    128,426/279,100 = 279,100/x
  3. Step 3: Cross multiply
    128,426x = 279,100 × 279,100
  4. Step 4: Simplify right side
    128,426x = 77,896,810,000
  5. Step 5: Solve for x
    x = 77,896,810,000/128,426
  6. Step 6: Final answer
    x = 606,550.15

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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.