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Finding the Fourth Proportional to 40.21, 55.43 and 30.96

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Solution

The fourth proportional to 40.21, 55.43 and 30.96 is: 42.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.21 : 55.43 = 30.96 : x
  2. Step 2: Convert to fraction form
    40.21/55.43 = 30.96/x
  3. Step 3: Cross multiply
    40.21x = 55.43 × 30.96
  4. Step 4: Simplify right side
    40.21x = 1,716.11
  5. Step 5: Solve for x
    x = 1,716.11/40.21
  6. Step 6: Final answer
    x = 42.68

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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.