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Finding the Fourth Proportional to 40.18, 55.73 and 38.81

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Solution

The fourth proportional to 40.18, 55.73 and 38.81 is: 53.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.18 : 55.73 = 38.81 : x
  2. Step 2: Convert to fraction form
    40.18/55.73 = 38.81/x
  3. Step 3: Cross multiply
    40.18x = 55.73 × 38.81
  4. Step 4: Simplify right side
    40.18x = 2,162.41
  5. Step 5: Solve for x
    x = 2,162.41/40.18
  6. Step 6: Final answer
    x = 53.82

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Why These Related Problems?

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