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Finding the Fourth Proportional to 220.49, 304.28 and 120.91

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Solution

The fourth proportional to 220.49, 304.28 and 120.91 is: 166.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.49 : 304.28 = 120.91 : x
  2. Step 2: Convert to fraction form
    220.49/304.28 = 120.91/x
  3. Step 3: Cross multiply
    220.49x = 304.28 × 120.91
  4. Step 4: Simplify right side
    220.49x = 36,789.13
  5. Step 5: Solve for x
    x = 36,789.13/220.49
  6. Step 6: Final answer
    x = 166.85

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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.