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Finding the Fourth Proportional to 39.48, 54.26 and 38.40

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Solution

The fourth proportional to 39.48, 54.26 and 38.40 is: 52.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.48 : 54.26 = 38.40 : x
  2. Step 2: Convert to fraction form
    39.48/54.26 = 38.40/x
  3. Step 3: Cross multiply
    39.48x = 54.26 × 38.40
  4. Step 4: Simplify right side
    39.48x = 2,083.58
  5. Step 5: Solve for x
    x = 2,083.58/39.48
  6. Step 6: Final answer
    x = 52.78

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.