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Finding the Fourth Proportional to 39.31, 54.63 and 38.89

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Solution

The fourth proportional to 39.31, 54.63 and 38.89 is: 54.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.31 : 54.63 = 38.89 : x
  2. Step 2: Convert to fraction form
    39.31/54.63 = 38.89/x
  3. Step 3: Cross multiply
    39.31x = 54.63 × 38.89
  4. Step 4: Simplify right side
    39.31x = 2,124.52
  5. Step 5: Solve for x
    x = 2,124.52/39.31
  6. Step 6: Final answer
    x = 54.04

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.