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Finding the Third Proportional to 7,920.75 and 12,540.75

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Solution

The third proportional to 7,920.75 and 12,540.75 is: 19,855.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.75 : 12,540.75 = 12,540.75 : x
  2. Step 2: Convert to fraction form
    7,920.75/12,540.75 = 12,540.75/x
  3. Step 3: Cross multiply
    7,920.75x = 12,540.75 × 12,540.75
  4. Step 4: Simplify right side
    7,920.75x = 157,270,410.56
  5. Step 5: Solve for x
    x = 157,270,410.56/7,920.75
  6. Step 6: Final answer
    x = 19,855.49

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.