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Finding the Third Proportional to 127,990 and 279,309

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Solution

The third proportional to 127,990 and 279,309 is: 609,528.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,990 : 279,309 = 279,309 : x
  2. Step 2: Convert to fraction form
    127,990/279,309 = 279,309/x
  3. Step 3: Cross multiply
    127,990x = 279,309 × 279,309
  4. Step 4: Simplify right side
    127,990x = 78,013,517,481
  5. Step 5: Solve for x
    x = 78,013,517,481/127,990
  6. Step 6: Final answer
    x = 609,528.22

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.