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Finding the Third Proportional to 6,690 and 15,489

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Solution

The third proportional to 6,690 and 15,489 is: 35,860.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,690 : 15,489 = 15,489 : x
  2. Step 2: Convert to fraction form
    6,690/15,489 = 15,489/x
  3. Step 3: Cross multiply
    6,690x = 15,489 × 15,489
  4. Step 4: Simplify right side
    6,690x = 239,909,121
  5. Step 5: Solve for x
    x = 239,909,121/6,690
  6. Step 6: Final answer
    x = 35,860.86

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.