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Finding the Fourth Proportional to 33.85, 46.69 and 20.90

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Solution

The fourth proportional to 33.85, 46.69 and 20.90 is: 28.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.85 : 46.69 = 20.90 : x
  2. Step 2: Convert to fraction form
    33.85/46.69 = 20.90/x
  3. Step 3: Cross multiply
    33.85x = 46.69 × 20.90
  4. Step 4: Simplify right side
    33.85x = 975.72
  5. Step 5: Solve for x
    x = 975.72/33.85
  6. Step 6: Final answer
    x = 28.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.