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Finding the Third Proportional to 128,213.88 and 279,004.25

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Solution

The third proportional to 128,213.88 and 279,004.25 is: 607,136.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,213.88 : 279,004.25 = 279,004.25 : x
  2. Step 2: Convert to fraction form
    128,213.88/279,004.25 = 279,004.25/x
  3. Step 3: Cross multiply
    128,213.88x = 279,004.25 × 279,004.25
  4. Step 4: Simplify right side
    128,213.88x = 77,843,371,518.06
  5. Step 5: Solve for x
    x = 77,843,371,518.06/128,213.88
  6. Step 6: Final answer
    x = 607,136.88

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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.