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Finding the Fourth Proportional to 41.28, 57.36 and 40.86

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Solution

The fourth proportional to 41.28, 57.36 and 40.86 is: 56.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.28 : 57.36 = 40.86 : x
  2. Step 2: Convert to fraction form
    41.28/57.36 = 40.86/x
  3. Step 3: Cross multiply
    41.28x = 57.36 × 40.86
  4. Step 4: Simplify right side
    41.28x = 2,343.73
  5. Step 5: Solve for x
    x = 2,343.73/41.28
  6. Step 6: Final answer
    x = 56.78

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These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.