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Finding the Fourth Proportional to 39.24, 54.19 and 31.11

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Solution

The fourth proportional to 39.24, 54.19 and 31.11 is: 42.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.24 : 54.19 = 31.11 : x
  2. Step 2: Convert to fraction form
    39.24/54.19 = 31.11/x
  3. Step 3: Cross multiply
    39.24x = 54.19 × 31.11
  4. Step 4: Simplify right side
    39.24x = 1,685.85
  5. Step 5: Solve for x
    x = 1,685.85/39.24
  6. Step 6: Final answer
    x = 42.96

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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.