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Finding the Third Proportional to 211.75 and 489.88

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Solution

The third proportional to 211.75 and 489.88 is: 1,133.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.75 : 489.88 = 489.88 : x
  2. Step 2: Convert to fraction form
    211.75/489.88 = 489.88/x
  3. Step 3: Cross multiply
    211.75x = 489.88 × 489.88
  4. Step 4: Simplify right side
    211.75x = 239,977.52
  5. Step 5: Solve for x
    x = 239,977.52/211.75
  6. Step 6: Final answer
    x = 1,133.31

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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.