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Finding the Third Proportional to 5,191 and 8,120

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Solution

The third proportional to 5,191 and 8,120 is: 12,701.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,191 : 8,120 = 8,120 : x
  2. Step 2: Convert to fraction form
    5,191/8,120 = 8,120/x
  3. Step 3: Cross multiply
    5,191x = 8,120 × 8,120
  4. Step 4: Simplify right side
    5,191x = 65,934,400
  5. Step 5: Solve for x
    x = 65,934,400/5,191
  6. Step 6: Final answer
    x = 12,701.68

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.