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Finding the Third Proportional to 153.25 and 218.31

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Solution

The third proportional to 153.25 and 218.31 is: 311.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.25 : 218.31 = 218.31 : x
  2. Step 2: Convert to fraction form
    153.25/218.31 = 218.31/x
  3. Step 3: Cross multiply
    153.25x = 218.31 × 218.31
  4. Step 4: Simplify right side
    153.25x = 47,660.35
  5. Step 5: Solve for x
    x = 47,660.35/153.25
  6. Step 6: Final answer
    x = 311.00

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.