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Finding the Fourth Proportional to 206.15, 308.41 and 154.91

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Solution

The fourth proportional to 206.15, 308.41 and 154.91 is: 231.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.15 : 308.41 = 154.91 : x
  2. Step 2: Convert to fraction form
    206.15/308.41 = 154.91/x
  3. Step 3: Cross multiply
    206.15x = 308.41 × 154.91
  4. Step 4: Simplify right side
    206.15x = 47,776.18
  5. Step 5: Solve for x
    x = 47,776.18/206.15
  6. Step 6: Final answer
    x = 231.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.