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Finding the Fourth Proportional to 220.70, 304.81 and 217.66

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Solution

The fourth proportional to 220.70, 304.81 and 217.66 is: 300.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.70 : 304.81 = 217.66 : x
  2. Step 2: Convert to fraction form
    220.70/304.81 = 217.66/x
  3. Step 3: Cross multiply
    220.70x = 304.81 × 217.66
  4. Step 4: Simplify right side
    220.70x = 66,343.64
  5. Step 5: Solve for x
    x = 66,343.64/220.70
  6. Step 6: Final answer
    x = 300.61

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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.