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Finding the Third Proportional to 9,000 and 18,990

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Solution

The third proportional to 9,000 and 18,990 is: 40,068.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,000 : 18,990 = 18,990 : x
  2. Step 2: Convert to fraction form
    9,000/18,990 = 18,990/x
  3. Step 3: Cross multiply
    9,000x = 18,990 × 18,990
  4. Step 4: Simplify right side
    9,000x = 360,620,100
  5. Step 5: Solve for x
    x = 360,620,100/9,000
  6. Step 6: Final answer
    x = 40,068.90

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.