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Finding the Fourth Proportional to 154.17, 211.89 and 149.85

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Solution

The fourth proportional to 154.17, 211.89 and 149.85 is: 205.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.17 : 211.89 = 149.85 : x
  2. Step 2: Convert to fraction form
    154.17/211.89 = 149.85/x
  3. Step 3: Cross multiply
    154.17x = 211.89 × 149.85
  4. Step 4: Simplify right side
    154.17x = 31,751.72
  5. Step 5: Solve for x
    x = 31,751.72/154.17
  6. Step 6: Final answer
    x = 205.95

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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.