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Finding the Fourth Proportional to 218.28, 326.78 and 153.96

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Solution

The fourth proportional to 218.28, 326.78 and 153.96 is: 230.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.28 : 326.78 = 153.96 : x
  2. Step 2: Convert to fraction form
    218.28/326.78 = 153.96/x
  3. Step 3: Cross multiply
    218.28x = 326.78 × 153.96
  4. Step 4: Simplify right side
    218.28x = 50,311.05
  5. Step 5: Solve for x
    x = 50,311.05/218.28
  6. Step 6: Final answer
    x = 230.49

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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.