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Finding the Fourth Proportional to 33.08, 45.64 and 20.81

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Solution

The fourth proportional to 33.08, 45.64 and 20.81 is: 28.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.08 : 45.64 = 20.81 : x
  2. Step 2: Convert to fraction form
    33.08/45.64 = 20.81/x
  3. Step 3: Cross multiply
    33.08x = 45.64 × 20.81
  4. Step 4: Simplify right side
    33.08x = 949.49
  5. Step 5: Solve for x
    x = 949.49/33.08
  6. Step 6: Final answer
    x = 28.70

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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.