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Finding the Third Proportional to 18,515 and 28,091

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Solution

The third proportional to 18,515 and 28,091 is: 42,619.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,515 : 28,091 = 28,091 : x
  2. Step 2: Convert to fraction form
    18,515/28,091 = 28,091/x
  3. Step 3: Cross multiply
    18,515x = 28,091 × 28,091
  4. Step 4: Simplify right side
    18,515x = 789,104,281
  5. Step 5: Solve for x
    x = 789,104,281/18,515
  6. Step 6: Final answer
    x = 42,619.73

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.