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Finding the Third Proportional to 1,890 and 4,059

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Solution

The third proportional to 1,890 and 4,059 is: 8,717.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890 : 4,059 = 4,059 : x
  2. Step 2: Convert to fraction form
    1,890/4,059 = 4,059/x
  3. Step 3: Cross multiply
    1,890x = 4,059 × 4,059
  4. Step 4: Simplify right side
    1,890x = 16,475,481
  5. Step 5: Solve for x
    x = 16,475,481/1,890
  6. Step 6: Final answer
    x = 8,717.19

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.