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Finding the Third Proportional to 18,720 and 40,439

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Solution

The third proportional to 18,720 and 40,439 is: 87,356.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720 : 40,439 = 40,439 : x
  2. Step 2: Convert to fraction form
    18,720/40,439 = 40,439/x
  3. Step 3: Cross multiply
    18,720x = 40,439 × 40,439
  4. Step 4: Simplify right side
    18,720x = 1,635,312,721
  5. Step 5: Solve for x
    x = 1,635,312,721/18,720
  6. Step 6: Final answer
    x = 87,356.45

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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.