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Finding the Third Proportional to 4,720 and 9,980

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Solution

The third proportional to 4,720 and 9,980 is: 21,101.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,720 : 9,980 = 9,980 : x
  2. Step 2: Convert to fraction form
    4,720/9,980 = 9,980/x
  3. Step 3: Cross multiply
    4,720x = 9,980 × 9,980
  4. Step 4: Simplify right side
    4,720x = 99,600,400
  5. Step 5: Solve for x
    x = 99,600,400/4,720
  6. Step 6: Final answer
    x = 21,101.78

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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.