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Finding the Third Proportional to 2,916 and 3,890

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Solution

The third proportional to 2,916 and 3,890 is: 5,189.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,916 : 3,890 = 3,890 : x
  2. Step 2: Convert to fraction form
    2,916/3,890 = 3,890/x
  3. Step 3: Cross multiply
    2,916x = 3,890 × 3,890
  4. Step 4: Simplify right side
    2,916x = 15,132,100
  5. Step 5: Solve for x
    x = 15,132,100/2,916
  6. Step 6: Final answer
    x = 5,189.33

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.