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Finding the Third Proportional to 38,915 and 85,372

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Solution

The third proportional to 38,915 and 85,372 is: 187,289.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,915 : 85,372 = 85,372 : x
  2. Step 2: Convert to fraction form
    38,915/85,372 = 85,372/x
  3. Step 3: Cross multiply
    38,915x = 85,372 × 85,372
  4. Step 4: Simplify right side
    38,915x = 7,288,378,384
  5. Step 5: Solve for x
    x = 7,288,378,384/38,915
  6. Step 6: Final answer
    x = 187,289.69

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.