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Finding the Third Proportional to 18,938 and 39,090

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Solution

The third proportional to 18,938 and 39,090 is: 80,685.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,938 : 39,090 = 39,090 : x
  2. Step 2: Convert to fraction form
    18,938/39,090 = 39,090/x
  3. Step 3: Cross multiply
    18,938x = 39,090 × 39,090
  4. Step 4: Simplify right side
    18,938x = 1,528,028,100
  5. Step 5: Solve for x
    x = 1,528,028,100/18,938
  6. Step 6: Final answer
    x = 80,685.82

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.