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Finding the Fourth Proportional to 218.88, 327.60 and 194.40

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Solution

The fourth proportional to 218.88, 327.60 and 194.40 is: 290.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.88 : 327.60 = 194.40 : x
  2. Step 2: Convert to fraction form
    218.88/327.60 = 194.40/x
  3. Step 3: Cross multiply
    218.88x = 327.60 × 194.40
  4. Step 4: Simplify right side
    218.88x = 63,685.44
  5. Step 5: Solve for x
    x = 63,685.44/218.88
  6. Step 6: Final answer
    x = 290.96

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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.