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Finding the Third Proportional to 18,939 and 28,409

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Solution

The third proportional to 18,939 and 28,409 is: 42,614.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939 : 28,409 = 28,409 : x
  2. Step 2: Convert to fraction form
    18,939/28,409 = 28,409/x
  3. Step 3: Cross multiply
    18,939x = 28,409 × 28,409
  4. Step 4: Simplify right side
    18,939x = 807,071,281
  5. Step 5: Solve for x
    x = 807,071,281/18,939
  6. Step 6: Final answer
    x = 42,614.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.