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Finding the Fourth Proportional to 218.61, 327.78 and 81.63

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Solution

The fourth proportional to 218.61, 327.78 and 81.63 is: 122.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.61 : 327.78 = 81.63 : x
  2. Step 2: Convert to fraction form
    218.61/327.78 = 81.63/x
  3. Step 3: Cross multiply
    218.61x = 327.78 × 81.63
  4. Step 4: Simplify right side
    218.61x = 26,756.68
  5. Step 5: Solve for x
    x = 26,756.68/218.61
  6. Step 6: Final answer
    x = 122.39

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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.