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Finding the Third Proportional to 3,120 and 5,420

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Solution

The third proportional to 3,120 and 5,420 is: 9,415.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120 : 5,420 = 5,420 : x
  2. Step 2: Convert to fraction form
    3,120/5,420 = 5,420/x
  3. Step 3: Cross multiply
    3,120x = 5,420 × 5,420
  4. Step 4: Simplify right side
    3,120x = 29,376,400
  5. Step 5: Solve for x
    x = 29,376,400/3,120
  6. Step 6: Final answer
    x = 9,415.51

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Why These Related Problems?

These problems maintain the same ratio (1.74) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.