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Finding the Fourth Proportional to 220.45, 304.21 and 122.21

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Solution

The fourth proportional to 220.45, 304.21 and 122.21 is: 168.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.45 : 304.21 = 122.21 : x
  2. Step 2: Convert to fraction form
    220.45/304.21 = 122.21/x
  3. Step 3: Cross multiply
    220.45x = 304.21 × 122.21
  4. Step 4: Simplify right side
    220.45x = 37,175.98
  5. Step 5: Solve for x
    x = 37,175.98/220.45
  6. Step 6: Final answer
    x = 168.63

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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.