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Finding the Third Proportional to 18,390 and 39,612

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Solution

The third proportional to 18,390 and 39,612 is: 85,324.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390 : 39,612 = 39,612 : x
  2. Step 2: Convert to fraction form
    18,390/39,612 = 39,612/x
  3. Step 3: Cross multiply
    18,390x = 39,612 × 39,612
  4. Step 4: Simplify right side
    18,390x = 1,569,110,544
  5. Step 5: Solve for x
    x = 1,569,110,544/18,390
  6. Step 6: Final answer
    x = 85,324.12

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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.