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Finding the Fourth Proportional to 39.44, 54.42 and 21.95

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Solution

The fourth proportional to 39.44, 54.42 and 21.95 is: 30.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.44 : 54.42 = 21.95 : x
  2. Step 2: Convert to fraction form
    39.44/54.42 = 21.95/x
  3. Step 3: Cross multiply
    39.44x = 54.42 × 21.95
  4. Step 4: Simplify right side
    39.44x = 1,194.52
  5. Step 5: Solve for x
    x = 1,194.52/39.44
  6. Step 6: Final answer
    x = 30.29

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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.