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Finding the Third Proportional to 4,380 and 9,489

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Solution

The third proportional to 4,380 and 9,489 is: 20,557.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,380 : 9,489 = 9,489 : x
  2. Step 2: Convert to fraction form
    4,380/9,489 = 9,489/x
  3. Step 3: Cross multiply
    4,380x = 9,489 × 9,489
  4. Step 4: Simplify right side
    4,380x = 90,041,121
  5. Step 5: Solve for x
    x = 90,041,121/4,380
  6. Step 6: Final answer
    x = 20,557.33

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.