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Finding the Fourth Proportional to 39.25, 54.18 and 29.56

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Solution

The fourth proportional to 39.25, 54.18 and 29.56 is: 40.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.25 : 54.18 = 29.56 : x
  2. Step 2: Convert to fraction form
    39.25/54.18 = 29.56/x
  3. Step 3: Cross multiply
    39.25x = 54.18 × 29.56
  4. Step 4: Simplify right side
    39.25x = 1,601.56
  5. Step 5: Solve for x
    x = 1,601.56/39.25
  6. Step 6: Final answer
    x = 40.80

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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.