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Finding the Fourth Proportional to 205.91, 308.87 and 103.25

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Solution

The fourth proportional to 205.91, 308.87 and 103.25 is: 154.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.91 : 308.87 = 103.25 : x
  2. Step 2: Convert to fraction form
    205.91/308.87 = 103.25/x
  3. Step 3: Cross multiply
    205.91x = 308.87 × 103.25
  4. Step 4: Simplify right side
    205.91x = 31,888.77
  5. Step 5: Solve for x
    x = 31,888.77/205.91
  6. Step 6: Final answer
    x = 154.87

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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.