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Finding the Fourth Proportional to 54.81, 75.61 and 31.48

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Solution

The fourth proportional to 54.81, 75.61 and 31.48 is: 43.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.81 : 75.61 = 31.48 : x
  2. Step 2: Convert to fraction form
    54.81/75.61 = 31.48/x
  3. Step 3: Cross multiply
    54.81x = 75.61 × 31.48
  4. Step 4: Simplify right side
    54.81x = 2,380.20
  5. Step 5: Solve for x
    x = 2,380.20/54.81
  6. Step 6: Final answer
    x = 43.43

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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.