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Finding the Third Proportional to 18,500 and 28,990

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Solution

The third proportional to 18,500 and 28,990 is: 45,428.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,500 : 28,990 = 28,990 : x
  2. Step 2: Convert to fraction form
    18,500/28,990 = 28,990/x
  3. Step 3: Cross multiply
    18,500x = 28,990 × 28,990
  4. Step 4: Simplify right side
    18,500x = 840,420,100
  5. Step 5: Solve for x
    x = 840,420,100/18,500
  6. Step 6: Final answer
    x = 45,428.11

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.