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Finding the Third Proportional to 5,390 and 7,801

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Solution

The third proportional to 5,390 and 7,801 is: 11,290.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,390 : 7,801 = 7,801 : x
  2. Step 2: Convert to fraction form
    5,390/7,801 = 7,801/x
  3. Step 3: Cross multiply
    5,390x = 7,801 × 7,801
  4. Step 4: Simplify right side
    5,390x = 60,855,601
  5. Step 5: Solve for x
    x = 60,855,601/5,390
  6. Step 6: Final answer
    x = 11,290.46

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.