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Finding the Third Proportional to 218.06 and 321.84

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Solution

The third proportional to 218.06 and 321.84 is: 475.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.06 : 321.84 = 321.84 : x
  2. Step 2: Convert to fraction form
    218.06/321.84 = 321.84/x
  3. Step 3: Cross multiply
    218.06x = 321.84 × 321.84
  4. Step 4: Simplify right side
    218.06x = 103,583.40
  5. Step 5: Solve for x
    x = 103,583.40/218.06
  6. Step 6: Final answer
    x = 475.02

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.