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Finding the Fourth Proportional to 154.76, 213.38 and 121.96

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Solution

The fourth proportional to 154.76, 213.38 and 121.96 is: 168.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.76 : 213.38 = 121.96 : x
  2. Step 2: Convert to fraction form
    154.76/213.38 = 121.96/x
  3. Step 3: Cross multiply
    154.76x = 213.38 × 121.96
  4. Step 4: Simplify right side
    154.76x = 26,023.42
  5. Step 5: Solve for x
    x = 26,023.42/154.76
  6. Step 6: Final answer
    x = 168.15

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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.