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Finding the Third Proportional to 7,480 and 20,320

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Solution

The third proportional to 7,480 and 20,320 is: 55,200.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,480 : 20,320 = 20,320 : x
  2. Step 2: Convert to fraction form
    7,480/20,320 = 20,320/x
  3. Step 3: Cross multiply
    7,480x = 20,320 × 20,320
  4. Step 4: Simplify right side
    7,480x = 412,902,400
  5. Step 5: Solve for x
    x = 412,902,400/7,480
  6. Step 6: Final answer
    x = 55,200.86

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Why These Related Problems?

These problems maintain the same ratio (2.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.