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Finding the Third Proportional to 2,115 and 2,904

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Solution

The third proportional to 2,115 and 2,904 is: 3,987.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115 : 2,904 = 2,904 : x
  2. Step 2: Convert to fraction form
    2,115/2,904 = 2,904/x
  3. Step 3: Cross multiply
    2,115x = 2,904 × 2,904
  4. Step 4: Simplify right side
    2,115x = 8,433,216
  5. Step 5: Solve for x
    x = 8,433,216/2,115
  6. Step 6: Final answer
    x = 3,987.34

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.