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Finding the Fourth Proportional to 262.88, 394.31 and 80.24

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Solution

The fourth proportional to 262.88, 394.31 and 80.24 is: 120.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.88 : 394.31 = 80.24 : x
  2. Step 2: Convert to fraction form
    262.88/394.31 = 80.24/x
  3. Step 3: Cross multiply
    262.88x = 394.31 × 80.24
  4. Step 4: Simplify right side
    262.88x = 31,640.02
  5. Step 5: Solve for x
    x = 31,640.02/262.88
  6. Step 6: Final answer
    x = 120.36

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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.