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Finding the Fourth Proportional to 33.66, 46.40 and 20.72

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Solution

The fourth proportional to 33.66, 46.40 and 20.72 is: 28.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.66 : 46.40 = 20.72 : x
  2. Step 2: Convert to fraction form
    33.66/46.40 = 20.72/x
  3. Step 3: Cross multiply
    33.66x = 46.40 × 20.72
  4. Step 4: Simplify right side
    33.66x = 961.41
  5. Step 5: Solve for x
    x = 961.41/33.66
  6. Step 6: Final answer
    x = 28.56

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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.