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Finding the Fourth Proportional to 220.10, 303.72 and 121.85

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Solution

The fourth proportional to 220.10, 303.72 and 121.85 is: 168.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.10 : 303.72 = 121.85 : x
  2. Step 2: Convert to fraction form
    220.10/303.72 = 121.85/x
  3. Step 3: Cross multiply
    220.10x = 303.72 × 121.85
  4. Step 4: Simplify right side
    220.10x = 37,006.76
  5. Step 5: Solve for x
    x = 37,006.76/220.10
  6. Step 6: Final answer
    x = 168.14

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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.