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Finding the Fourth Proportional to 40.20, 54.97 and 39.96

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Solution

The fourth proportional to 40.20, 54.97 and 39.96 is: 54.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.20 : 54.97 = 39.96 : x
  2. Step 2: Convert to fraction form
    40.20/54.97 = 39.96/x
  3. Step 3: Cross multiply
    40.20x = 54.97 × 39.96
  4. Step 4: Simplify right side
    40.20x = 2,196.60
  5. Step 5: Solve for x
    x = 2,196.60/40.20
  6. Step 6: Final answer
    x = 54.64

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.