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Finding the Third Proportional to 221.72 and 487.03

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Solution

The third proportional to 221.72 and 487.03 is: 1,069.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.72 : 487.03 = 487.03 : x
  2. Step 2: Convert to fraction form
    221.72/487.03 = 487.03/x
  3. Step 3: Cross multiply
    221.72x = 487.03 × 487.03
  4. Step 4: Simplify right side
    221.72x = 237,199.44
  5. Step 5: Solve for x
    x = 237,199.44/221.72
  6. Step 6: Final answer
    x = 1,069.82

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.