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Finding the Third Proportional to 4,920.75 and 10,815.40

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Solution

The third proportional to 4,920.75 and 10,815.40 is: 23,771.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,920.75 : 10,815.40 = 10,815.40 : x
  2. Step 2: Convert to fraction form
    4,920.75/10,815.40 = 10,815.40/x
  3. Step 3: Cross multiply
    4,920.75x = 10,815.40 × 10,815.40
  4. Step 4: Simplify right side
    4,920.75x = 116,972,843.36
  5. Step 5: Solve for x
    x = 116,972,843.36/4,920.75
  6. Step 6: Final answer
    x = 23,771.34

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.