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Finding the Fourth Proportional to 38.88, 57.96 and 33.20

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Solution

The fourth proportional to 38.88, 57.96 and 33.20 is: 49.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.88 : 57.96 = 33.20 : x
  2. Step 2: Convert to fraction form
    38.88/57.96 = 33.20/x
  3. Step 3: Cross multiply
    38.88x = 57.96 × 33.20
  4. Step 4: Simplify right side
    38.88x = 1,924.27
  5. Step 5: Solve for x
    x = 1,924.27/38.88
  6. Step 6: Final answer
    x = 49.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.