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Finding the Third Proportional to 218,781 and 279,531

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Solution

The third proportional to 218,781 and 279,531 is: 357,149.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,781 : 279,531 = 279,531 : x
  2. Step 2: Convert to fraction form
    218,781/279,531 = 279,531/x
  3. Step 3: Cross multiply
    218,781x = 279,531 × 279,531
  4. Step 4: Simplify right side
    218,781x = 78,137,579,961
  5. Step 5: Solve for x
    x = 78,137,579,961/218,781
  6. Step 6: Final answer
    x = 357,149.75

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.