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Finding the Third Proportional to 2,187 and 3,432

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Solution

The third proportional to 2,187 and 3,432 is: 5,385.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187 : 3,432 = 3,432 : x
  2. Step 2: Convert to fraction form
    2,187/3,432 = 3,432/x
  3. Step 3: Cross multiply
    2,187x = 3,432 × 3,432
  4. Step 4: Simplify right side
    2,187x = 11,778,624
  5. Step 5: Solve for x
    x = 11,778,624/2,187
  6. Step 6: Final answer
    x = 5,385.74

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.