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Finding the Fourth Proportional to 205.18, 306.99 and 136.87

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Solution

The fourth proportional to 205.18, 306.99 and 136.87 is: 204.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.18 : 306.99 = 136.87 : x
  2. Step 2: Convert to fraction form
    205.18/306.99 = 136.87/x
  3. Step 3: Cross multiply
    205.18x = 306.99 × 136.87
  4. Step 4: Simplify right side
    205.18x = 42,017.72
  5. Step 5: Solve for x
    x = 42,017.72/205.18
  6. Step 6: Final answer
    x = 204.78

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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.