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Finding the Third Proportional to 3,389 and 5,120

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Solution

The third proportional to 3,389 and 5,120 is: 7,735.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,389 : 5,120 = 5,120 : x
  2. Step 2: Convert to fraction form
    3,389/5,120 = 5,120/x
  3. Step 3: Cross multiply
    3,389x = 5,120 × 5,120
  4. Step 4: Simplify right side
    3,389x = 26,214,400
  5. Step 5: Solve for x
    x = 26,214,400/3,389
  6. Step 6: Final answer
    x = 7,735.14

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.