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Finding the Fourth Proportional to 220.19, 303.86 and 121.95

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Solution

The fourth proportional to 220.19, 303.86 and 121.95 is: 168.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.19 : 303.86 = 121.95 : x
  2. Step 2: Convert to fraction form
    220.19/303.86 = 121.95/x
  3. Step 3: Cross multiply
    220.19x = 303.86 × 121.95
  4. Step 4: Simplify right side
    220.19x = 37,055.12
  5. Step 5: Solve for x
    x = 37,055.12/220.19
  6. Step 6: Final answer
    x = 168.29

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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.