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Finding the Third Proportional to 2,139 and 3,390

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Solution

The third proportional to 2,139 and 3,390 is: 5,372.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139 : 3,390 = 3,390 : x
  2. Step 2: Convert to fraction form
    2,139/3,390 = 3,390/x
  3. Step 3: Cross multiply
    2,139x = 3,390 × 3,390
  4. Step 4: Simplify right side
    2,139x = 11,492,100
  5. Step 5: Solve for x
    x = 11,492,100/2,139
  6. Step 6: Final answer
    x = 5,372.65

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.