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Finding the Fourth Proportional to 154.72, 213.16 and 121.96

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Solution

The fourth proportional to 154.72, 213.16 and 121.96 is: 168.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.72 : 213.16 = 121.96 : x
  2. Step 2: Convert to fraction form
    154.72/213.16 = 121.96/x
  3. Step 3: Cross multiply
    154.72x = 213.16 × 121.96
  4. Step 4: Simplify right side
    154.72x = 25,996.99
  5. Step 5: Solve for x
    x = 25,996.99/154.72
  6. Step 6: Final answer
    x = 168.03

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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.