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Finding the Fourth Proportional to 54.30, 81.37 and 39.98

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Solution

The fourth proportional to 54.30, 81.37 and 39.98 is: 59.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.30 : 81.37 = 39.98 : x
  2. Step 2: Convert to fraction form
    54.30/81.37 = 39.98/x
  3. Step 3: Cross multiply
    54.30x = 81.37 × 39.98
  4. Step 4: Simplify right side
    54.30x = 3,253.17
  5. Step 5: Solve for x
    x = 3,253.17/54.30
  6. Step 6: Final answer
    x = 59.91

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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.