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Finding the Fourth Proportional to 206.15, 308.74 and 103.11

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Solution

The fourth proportional to 206.15, 308.74 and 103.11 is: 154.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.15 : 308.74 = 103.11 : x
  2. Step 2: Convert to fraction form
    206.15/308.74 = 103.11/x
  3. Step 3: Cross multiply
    206.15x = 308.74 × 103.11
  4. Step 4: Simplify right side
    206.15x = 31,834.18
  5. Step 5: Solve for x
    x = 31,834.18/206.15
  6. Step 6: Final answer
    x = 154.42

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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.