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Finding the Fourth Proportional to 39.10, 54.33 and 38.62

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Solution

The fourth proportional to 39.10, 54.33 and 38.62 is: 53.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.10 : 54.33 = 38.62 : x
  2. Step 2: Convert to fraction form
    39.10/54.33 = 38.62/x
  3. Step 3: Cross multiply
    39.10x = 54.33 × 38.62
  4. Step 4: Simplify right side
    39.10x = 2,097.95
  5. Step 5: Solve for x
    x = 2,097.95/39.10
  6. Step 6: Final answer
    x = 53.66

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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.