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Finding the Fourth Proportional to 220.91, 305.43 and 217.64

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Solution

The fourth proportional to 220.91, 305.43 and 217.64 is: 300.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.91 : 305.43 = 217.64 : x
  2. Step 2: Convert to fraction form
    220.91/305.43 = 217.64/x
  3. Step 3: Cross multiply
    220.91x = 305.43 × 217.64
  4. Step 4: Simplify right side
    220.91x = 66,473.79
  5. Step 5: Solve for x
    x = 66,473.79/220.91
  6. Step 6: Final answer
    x = 300.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.