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Finding the Third Proportional to 78,720 and 124,644

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Solution

The third proportional to 78,720 and 124,644 is: 197,359.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,720 : 124,644 = 124,644 : x
  2. Step 2: Convert to fraction form
    78,720/124,644 = 124,644/x
  3. Step 3: Cross multiply
    78,720x = 124,644 × 124,644
  4. Step 4: Simplify right side
    78,720x = 15,536,126,736
  5. Step 5: Solve for x
    x = 15,536,126,736/78,720
  6. Step 6: Final answer
    x = 197,359.33

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.