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Finding the Fourth Proportional to 218.70, 326.30 and 198.54

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Solution

The fourth proportional to 218.70, 326.30 and 198.54 is: 296.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.70 : 326.30 = 198.54 : x
  2. Step 2: Convert to fraction form
    218.70/326.30 = 198.54/x
  3. Step 3: Cross multiply
    218.70x = 326.30 × 198.54
  4. Step 4: Simplify right side
    218.70x = 64,782.61
  5. Step 5: Solve for x
    x = 64,782.61/218.70
  6. Step 6: Final answer
    x = 296.22

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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.