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Finding the Third Proportional to 6,640 and 7,408

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Solution

The third proportional to 6,640 and 7,408 is: 8,264.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640 : 7,408 = 7,408 : x
  2. Step 2: Convert to fraction form
    6,640/7,408 = 7,408/x
  3. Step 3: Cross multiply
    6,640x = 7,408 × 7,408
  4. Step 4: Simplify right side
    6,640x = 54,878,464
  5. Step 5: Solve for x
    x = 54,878,464/6,640
  6. Step 6: Final answer
    x = 8,264.83

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.