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Finding the Fourth Proportional to 220.72, 304.56 and 122.46

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Solution

The fourth proportional to 220.72, 304.56 and 122.46 is: 168.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.72 : 304.56 = 122.46 : x
  2. Step 2: Convert to fraction form
    220.72/304.56 = 122.46/x
  3. Step 3: Cross multiply
    220.72x = 304.56 × 122.46
  4. Step 4: Simplify right side
    220.72x = 37,296.88
  5. Step 5: Solve for x
    x = 37,296.88/220.72
  6. Step 6: Final answer
    x = 168.98

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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.