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Finding the Fourth Proportional to 262.87, 394.31 and 80.26

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Solution

The fourth proportional to 262.87, 394.31 and 80.26 is: 120.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.87 : 394.31 = 80.26 : x
  2. Step 2: Convert to fraction form
    262.87/394.31 = 80.26/x
  3. Step 3: Cross multiply
    262.87x = 394.31 × 80.26
  4. Step 4: Simplify right side
    262.87x = 31,646.54
  5. Step 5: Solve for x
    x = 31,646.54/262.87
  6. Step 6: Final answer
    x = 120.39

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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.