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Finding the Third Proportional to 78,390 and 172,387

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Solution

The third proportional to 78,390 and 172,387 is: 379,095.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390 : 172,387 = 172,387 : x
  2. Step 2: Convert to fraction form
    78,390/172,387 = 172,387/x
  3. Step 3: Cross multiply
    78,390x = 172,387 × 172,387
  4. Step 4: Simplify right side
    78,390x = 29,717,277,769
  5. Step 5: Solve for x
    x = 29,717,277,769/78,390
  6. Step 6: Final answer
    x = 379,095.26

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.