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Finding the Fourth Proportional to 38.86, 57.90 and 36.12

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Solution

The fourth proportional to 38.86, 57.90 and 36.12 is: 53.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.86 : 57.90 = 36.12 : x
  2. Step 2: Convert to fraction form
    38.86/57.90 = 36.12/x
  3. Step 3: Cross multiply
    38.86x = 57.90 × 36.12
  4. Step 4: Simplify right side
    38.86x = 2,091.58
  5. Step 5: Solve for x
    x = 2,091.58/38.86
  6. Step 6: Final answer
    x = 53.83

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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.