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Finding the Fourth Proportional to 220.39, 305.44 and 217.89

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Solution

The fourth proportional to 220.39, 305.44 and 217.89 is: 301.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.39 : 305.44 = 217.89 : x
  2. Step 2: Convert to fraction form
    220.39/305.44 = 217.89/x
  3. Step 3: Cross multiply
    220.39x = 305.44 × 217.89
  4. Step 4: Simplify right side
    220.39x = 66,551.78
  5. Step 5: Solve for x
    x = 66,551.78/220.39
  6. Step 6: Final answer
    x = 301.98

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.