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Finding the Third Proportional to 2,120 and 2,580

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Solution

The third proportional to 2,120 and 2,580 is: 3,139.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120 : 2,580 = 2,580 : x
  2. Step 2: Convert to fraction form
    2,120/2,580 = 2,580/x
  3. Step 3: Cross multiply
    2,120x = 2,580 × 2,580
  4. Step 4: Simplify right side
    2,120x = 6,656,400
  5. Step 5: Solve for x
    x = 6,656,400/2,120
  6. Step 6: Final answer
    x = 3,139.81

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.