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Finding the Third Proportional to 3,890 and 9,145

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Solution

The third proportional to 3,890 and 9,145 is: 21,498.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,890 : 9,145 = 9,145 : x
  2. Step 2: Convert to fraction form
    3,890/9,145 = 9,145/x
  3. Step 3: Cross multiply
    3,890x = 9,145 × 9,145
  4. Step 4: Simplify right side
    3,890x = 83,631,025
  5. Step 5: Solve for x
    x = 83,631,025/3,890
  6. Step 6: Final answer
    x = 21,498.98

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Why These Related Problems?

These problems maintain the same ratio (2.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.