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Finding the Third Proportional to 128,880 and 279,900

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Solution

The third proportional to 128,880 and 279,900 is: 607,883.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,880 : 279,900 = 279,900 : x
  2. Step 2: Convert to fraction form
    128,880/279,900 = 279,900/x
  3. Step 3: Cross multiply
    128,880x = 279,900 × 279,900
  4. Step 4: Simplify right side
    128,880x = 78,344,010,000
  5. Step 5: Solve for x
    x = 78,344,010,000/128,880
  6. Step 6: Final answer
    x = 607,883.38

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.