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Finding the Third Proportional to 78,779 and 172,867

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Solution

The third proportional to 78,779 and 172,867 is: 379,326.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,779 : 172,867 = 172,867 : x
  2. Step 2: Convert to fraction form
    78,779/172,867 = 172,867/x
  3. Step 3: Cross multiply
    78,779x = 172,867 × 172,867
  4. Step 4: Simplify right side
    78,779x = 29,882,999,689
  5. Step 5: Solve for x
    x = 29,882,999,689/78,779
  6. Step 6: Final answer
    x = 379,326.97

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.