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Finding the Fourth Proportional to 154.12, 211.19 and 139.54

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Solution

The fourth proportional to 154.12, 211.19 and 139.54 is: 191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.12 : 211.19 = 139.54 : x
  2. Step 2: Convert to fraction form
    154.12/211.19 = 139.54/x
  3. Step 3: Cross multiply
    154.12x = 211.19 × 139.54
  4. Step 4: Simplify right side
    154.12x = 29,469.45
  5. Step 5: Solve for x
    x = 29,469.45/154.12
  6. Step 6: Final answer
    x = 191.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.