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Finding the Fourth Proportional to 218.32, 326.88 and 146.20

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Solution

The fourth proportional to 218.32, 326.88 and 146.20 is: 218.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.32 : 326.88 = 146.20 : x
  2. Step 2: Convert to fraction form
    218.32/326.88 = 146.20/x
  3. Step 3: Cross multiply
    218.32x = 326.88 × 146.20
  4. Step 4: Simplify right side
    218.32x = 47,789.86
  5. Step 5: Solve for x
    x = 47,789.86/218.32
  6. Step 6: Final answer
    x = 218.90

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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.