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Finding the Fourth Proportional to 263.37, 395.09 and 80.76

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Solution

The fourth proportional to 263.37, 395.09 and 80.76 is: 121.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.37 : 395.09 = 80.76 : x
  2. Step 2: Convert to fraction form
    263.37/395.09 = 80.76/x
  3. Step 3: Cross multiply
    263.37x = 395.09 × 80.76
  4. Step 4: Simplify right side
    263.37x = 31,907.47
  5. Step 5: Solve for x
    x = 31,907.47/263.37
  6. Step 6: Final answer
    x = 121.15

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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.