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Finding the Third Proportional to 2,872 and 3,480

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Solution

The third proportional to 2,872 and 3,480 is: 4,216.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,872 : 3,480 = 3,480 : x
  2. Step 2: Convert to fraction form
    2,872/3,480 = 3,480/x
  3. Step 3: Cross multiply
    2,872x = 3,480 × 3,480
  4. Step 4: Simplify right side
    2,872x = 12,110,400
  5. Step 5: Solve for x
    x = 12,110,400/2,872
  6. Step 6: Final answer
    x = 4,216.71

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.