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Finding the Third Proportional to 218.50 and 326.56

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Solution

The third proportional to 218.50 and 326.56 is: 488.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.50 : 326.56 = 326.56 : x
  2. Step 2: Convert to fraction form
    218.50/326.56 = 326.56/x
  3. Step 3: Cross multiply
    218.50x = 326.56 × 326.56
  4. Step 4: Simplify right side
    218.50x = 106,643.07
  5. Step 5: Solve for x
    x = 106,643.07/218.50
  6. Step 6: Final answer
    x = 488.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.