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Finding the Fourth Proportional to 218.67, 328.09 and 122.55

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Solution

The fourth proportional to 218.67, 328.09 and 122.55 is: 183.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.67 : 328.09 = 122.55 : x
  2. Step 2: Convert to fraction form
    218.67/328.09 = 122.55/x
  3. Step 3: Cross multiply
    218.67x = 328.09 × 122.55
  4. Step 4: Simplify right side
    218.67x = 40,207.43
  5. Step 5: Solve for x
    x = 40,207.43/218.67
  6. Step 6: Final answer
    x = 183.87

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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.