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Finding the Third Proportional to 2,178 and 4,005

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Solution

The third proportional to 2,178 and 4,005 is: 7,364.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,178 : 4,005 = 4,005 : x
  2. Step 2: Convert to fraction form
    2,178/4,005 = 4,005/x
  3. Step 3: Cross multiply
    2,178x = 4,005 × 4,005
  4. Step 4: Simplify right side
    2,178x = 16,040,025
  5. Step 5: Solve for x
    x = 16,040,025/2,178
  6. Step 6: Final answer
    x = 7,364.57

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.