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Finding the Third Proportional to 128,790 and 276,456

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Solution

The third proportional to 128,790 and 276,456 is: 593,430.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,790 : 276,456 = 276,456 : x
  2. Step 2: Convert to fraction form
    128,790/276,456 = 276,456/x
  3. Step 3: Cross multiply
    128,790x = 276,456 × 276,456
  4. Step 4: Simplify right side
    128,790x = 76,427,919,936
  5. Step 5: Solve for x
    x = 76,427,919,936/128,790
  6. Step 6: Final answer
    x = 593,430.55

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.