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Finding the Third Proportional to 7,200 and 15,489

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Solution

The third proportional to 7,200 and 15,489 is: 33,320.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,200 : 15,489 = 15,489 : x
  2. Step 2: Convert to fraction form
    7,200/15,489 = 15,489/x
  3. Step 3: Cross multiply
    7,200x = 15,489 × 15,489
  4. Step 4: Simplify right side
    7,200x = 239,909,121
  5. Step 5: Solve for x
    x = 239,909,121/7,200
  6. Step 6: Final answer
    x = 33,320.71

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.