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Finding the Fourth Proportional to 218.88, 326.61 and 194.60

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Solution

The fourth proportional to 218.88, 326.61 and 194.60 is: 290.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.88 : 326.61 = 194.60 : x
  2. Step 2: Convert to fraction form
    218.88/326.61 = 194.60/x
  3. Step 3: Cross multiply
    218.88x = 326.61 × 194.60
  4. Step 4: Simplify right side
    218.88x = 63,558.31
  5. Step 5: Solve for x
    x = 63,558.31/218.88
  6. Step 6: Final answer
    x = 290.38

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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.