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Finding the Third Proportional to 7,220 and 8,408

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Solution

The third proportional to 7,220 and 8,408 is: 9,791.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,220 : 8,408 = 8,408 : x
  2. Step 2: Convert to fraction form
    7,220/8,408 = 8,408/x
  3. Step 3: Cross multiply
    7,220x = 8,408 × 8,408
  4. Step 4: Simplify right side
    7,220x = 70,694,464
  5. Step 5: Solve for x
    x = 70,694,464/7,220
  6. Step 6: Final answer
    x = 9,791.48

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Why These Related Problems?

These problems maintain the same ratio (1.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.