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Finding the Fourth Proportional to 55.31, 75.87 and 54.54

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Solution

The fourth proportional to 55.31, 75.87 and 54.54 is: 74.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.31 : 75.87 = 54.54 : x
  2. Step 2: Convert to fraction form
    55.31/75.87 = 54.54/x
  3. Step 3: Cross multiply
    55.31x = 75.87 × 54.54
  4. Step 4: Simplify right side
    55.31x = 4,137.95
  5. Step 5: Solve for x
    x = 4,137.95/55.31
  6. Step 6: Final answer
    x = 74.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.