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Finding the Fourth Proportional to 218.43, 326.85 and 188.35

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Solution

The fourth proportional to 218.43, 326.85 and 188.35 is: 281.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.43 : 326.85 = 188.35 : x
  2. Step 2: Convert to fraction form
    218.43/326.85 = 188.35/x
  3. Step 3: Cross multiply
    218.43x = 326.85 × 188.35
  4. Step 4: Simplify right side
    218.43x = 61,562.20
  5. Step 5: Solve for x
    x = 61,562.20/218.43
  6. Step 6: Final answer
    x = 281.84

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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.