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Finding the Third Proportional to 2,187 and 4,721

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Solution

The third proportional to 2,187 and 4,721 is: 10,191.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187 : 4,721 = 4,721 : x
  2. Step 2: Convert to fraction form
    2,187/4,721 = 4,721/x
  3. Step 3: Cross multiply
    2,187x = 4,721 × 4,721
  4. Step 4: Simplify right side
    2,187x = 22,287,841
  5. Step 5: Solve for x
    x = 22,287,841/2,187
  6. Step 6: Final answer
    x = 10,191.06

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.