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Finding the Third Proportional to 129,715 and 279,440

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Solution

The third proportional to 129,715 and 279,440 is: 601,986.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,715 : 279,440 = 279,440 : x
  2. Step 2: Convert to fraction form
    129,715/279,440 = 279,440/x
  3. Step 3: Cross multiply
    129,715x = 279,440 × 279,440
  4. Step 4: Simplify right side
    129,715x = 78,086,713,600
  5. Step 5: Solve for x
    x = 78,086,713,600/129,715
  6. Step 6: Final answer
    x = 601,986.77

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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.