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Finding the Fourth Proportional to 205.85, 308.85 and 108.35

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Solution

The fourth proportional to 205.85, 308.85 and 108.35 is: 162.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.85 : 308.85 = 108.35 : x
  2. Step 2: Convert to fraction form
    205.85/308.85 = 108.35/x
  3. Step 3: Cross multiply
    205.85x = 308.85 × 108.35
  4. Step 4: Simplify right side
    205.85x = 33,463.11
  5. Step 5: Solve for x
    x = 33,463.11/205.85
  6. Step 6: Final answer
    x = 162.56

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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.