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Finding the Fourth Proportional to 71.70, 107.38 and 54.56

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Solution

The fourth proportional to 71.70, 107.38 and 54.56 is: 81.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.70 : 107.38 = 54.56 : x
  2. Step 2: Convert to fraction form
    71.70/107.38 = 54.56/x
  3. Step 3: Cross multiply
    71.70x = 107.38 × 54.56
  4. Step 4: Simplify right side
    71.70x = 5,858.65
  5. Step 5: Solve for x
    x = 5,858.65/71.70
  6. Step 6: Final answer
    x = 81.71

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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.