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Finding the Third Proportional to 99.28 and 219.66

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Solution

The third proportional to 99.28 and 219.66 is: 485.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.28 : 219.66 = 219.66 : x
  2. Step 2: Convert to fraction form
    99.28/219.66 = 219.66/x
  3. Step 3: Cross multiply
    99.28x = 219.66 × 219.66
  4. Step 4: Simplify right side
    99.28x = 48,248.87
  5. Step 5: Solve for x
    x = 48,248.87/99.28
  6. Step 6: Final answer
    x = 485.98

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.