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Finding the Fourth Proportional to 41.21, 56.86 and 39.72

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Solution

The fourth proportional to 41.21, 56.86 and 39.72 is: 54.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.21 : 56.86 = 39.72 : x
  2. Step 2: Convert to fraction form
    41.21/56.86 = 39.72/x
  3. Step 3: Cross multiply
    41.21x = 56.86 × 39.72
  4. Step 4: Simplify right side
    41.21x = 2,258.38
  5. Step 5: Solve for x
    x = 2,258.38/41.21
  6. Step 6: Final answer
    x = 54.81

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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.