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Finding the Fourth Proportional to 218.31, 326.66 and 131.70

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Solution

The fourth proportional to 218.31, 326.66 and 131.70 is: 197.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.31 : 326.66 = 131.70 : x
  2. Step 2: Convert to fraction form
    218.31/326.66 = 131.70/x
  3. Step 3: Cross multiply
    218.31x = 326.66 × 131.70
  4. Step 4: Simplify right side
    218.31x = 43,020.46
  5. Step 5: Solve for x
    x = 43,020.46/218.31
  6. Step 6: Final answer
    x = 197.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.