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Finding the Fourth Proportional to 54.28, 81.34 and 38.00

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Solution

The fourth proportional to 54.28, 81.34 and 38.00 is: 56.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.28 : 81.34 = 38.00 : x
  2. Step 2: Convert to fraction form
    54.28/81.34 = 38.00/x
  3. Step 3: Cross multiply
    54.28x = 81.34 × 38.00
  4. Step 4: Simplify right side
    54.28x = 3,090.57
  5. Step 5: Solve for x
    x = 3,090.57/54.28
  6. Step 6: Final answer
    x = 56.94

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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.