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Finding the Fourth Proportional to 33.05, 49.59 and 13.80

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Solution

The fourth proportional to 33.05, 49.59 and 13.80 is: 20.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.05 : 49.59 = 13.80 : x
  2. Step 2: Convert to fraction form
    33.05/49.59 = 13.80/x
  3. Step 3: Cross multiply
    33.05x = 49.59 × 13.80
  4. Step 4: Simplify right side
    33.05x = 684.34
  5. Step 5: Solve for x
    x = 684.34/33.05
  6. Step 6: Final answer
    x = 20.71

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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.