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Finding the Fourth Proportional to 54.12, 74.60 and 39.54

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Solution

The fourth proportional to 54.12, 74.60 and 39.54 is: 54.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.12 : 74.60 = 39.54 : x
  2. Step 2: Convert to fraction form
    54.12/74.60 = 39.54/x
  3. Step 3: Cross multiply
    54.12x = 74.60 × 39.54
  4. Step 4: Simplify right side
    54.12x = 2,949.68
  5. Step 5: Solve for x
    x = 2,949.68/54.12
  6. Step 6: Final answer
    x = 54.50

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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.