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Finding the Fourth Proportional to 54.58, 81.35 and 51.31

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Solution

The fourth proportional to 54.58, 81.35 and 51.31 is: 76.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.58 : 81.35 = 51.31 : x
  2. Step 2: Convert to fraction form
    54.58/81.35 = 51.31/x
  3. Step 3: Cross multiply
    54.58x = 81.35 × 51.31
  4. Step 4: Simplify right side
    54.58x = 4,174.07
  5. Step 5: Solve for x
    x = 4,174.07/54.58
  6. Step 6: Final answer
    x = 76.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.