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Finding the Third Proportional to 220.13 and 489.75

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Solution

The third proportional to 220.13 and 489.75 is: 1,089.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.13 : 489.75 = 489.75 : x
  2. Step 2: Convert to fraction form
    220.13/489.75 = 489.75/x
  3. Step 3: Cross multiply
    220.13x = 489.75 × 489.75
  4. Step 4: Simplify right side
    220.13x = 239,855.06
  5. Step 5: Solve for x
    x = 239,855.06/220.13
  6. Step 6: Final answer
    x = 1,089.63

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.