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Finding the Third Proportional to 212.25 and 489.28

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Solution

The third proportional to 212.25 and 489.28 is: 1,127.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.25 : 489.28 = 489.28 : x
  2. Step 2: Convert to fraction form
    212.25/489.28 = 489.28/x
  3. Step 3: Cross multiply
    212.25x = 489.28 × 489.28
  4. Step 4: Simplify right side
    212.25x = 239,396.14
  5. Step 5: Solve for x
    x = 239,396.14/212.25
  6. Step 6: Final answer
    x = 1,127.90

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Why These Related Problems?

These problems maintain the same ratio (2.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.