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Finding the Third Proportional to 2,187 and 3,216

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Solution

The third proportional to 2,187 and 3,216 is: 4,729.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187 : 3,216 = 3,216 : x
  2. Step 2: Convert to fraction form
    2,187/3,216 = 3,216/x
  3. Step 3: Cross multiply
    2,187x = 3,216 × 3,216
  4. Step 4: Simplify right side
    2,187x = 10,342,656
  5. Step 5: Solve for x
    x = 10,342,656/2,187
  6. Step 6: Final answer
    x = 4,729.15

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.