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Finding the Third Proportional to 138,678 and 299,454

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Solution

The third proportional to 138,678 and 299,454 is: 646,625.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,678 : 299,454 = 299,454 : x
  2. Step 2: Convert to fraction form
    138,678/299,454 = 299,454/x
  3. Step 3: Cross multiply
    138,678x = 299,454 × 299,454
  4. Step 4: Simplify right side
    138,678x = 89,672,698,116
  5. Step 5: Solve for x
    x = 89,672,698,116/138,678
  6. Step 6: Final answer
    x = 646,625.26

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.