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Finding the Fourth Proportional to 39.35, 54.23 and 38.87

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Solution

The fourth proportional to 39.35, 54.23 and 38.87 is: 53.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.35 : 54.23 = 38.87 : x
  2. Step 2: Convert to fraction form
    39.35/54.23 = 38.87/x
  3. Step 3: Cross multiply
    39.35x = 54.23 × 38.87
  4. Step 4: Simplify right side
    39.35x = 2,107.45
  5. Step 5: Solve for x
    x = 2,107.45/39.35
  6. Step 6: Final answer
    x = 53.56

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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.