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Finding the Fourth Proportional to 54.02, 81.06 and 38.90

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Solution

The fourth proportional to 54.02, 81.06 and 38.90 is: 58.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.02 : 81.06 = 38.90 : x
  2. Step 2: Convert to fraction form
    54.02/81.06 = 38.90/x
  3. Step 3: Cross multiply
    54.02x = 81.06 × 38.90
  4. Step 4: Simplify right side
    54.02x = 3,153.23
  5. Step 5: Solve for x
    x = 3,153.23/54.02
  6. Step 6: Final answer
    x = 58.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.