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Finding the Third Proportional to 5,398 and 8,240

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Solution

The third proportional to 5,398 and 8,240 is: 12,578.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,398 : 8,240 = 8,240 : x
  2. Step 2: Convert to fraction form
    5,398/8,240 = 8,240/x
  3. Step 3: Cross multiply
    5,398x = 8,240 × 8,240
  4. Step 4: Simplify right side
    5,398x = 67,897,600
  5. Step 5: Solve for x
    x = 67,897,600/5,398
  6. Step 6: Final answer
    x = 12,578.29

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.