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Finding the Fourth Proportional to 219.91, 303.46 and 121.66

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Solution

The fourth proportional to 219.91, 303.46 and 121.66 is: 167.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.91 : 303.46 = 121.66 : x
  2. Step 2: Convert to fraction form
    219.91/303.46 = 121.66/x
  3. Step 3: Cross multiply
    219.91x = 303.46 × 121.66
  4. Step 4: Simplify right side
    219.91x = 36,918.94
  5. Step 5: Solve for x
    x = 36,918.94/219.91
  6. Step 6: Final answer
    x = 167.88

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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.