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Finding the Third Proportional to 2,139 and 2,879

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Solution

The third proportional to 2,139 and 2,879 is: 3,875.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139 : 2,879 = 2,879 : x
  2. Step 2: Convert to fraction form
    2,139/2,879 = 2,879/x
  3. Step 3: Cross multiply
    2,139x = 2,879 × 2,879
  4. Step 4: Simplify right side
    2,139x = 8,288,641
  5. Step 5: Solve for x
    x = 8,288,641/2,139
  6. Step 6: Final answer
    x = 3,875.01

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.