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Finding the Fourth Proportional to 263.28, 394.86 and 80.57

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Solution

The fourth proportional to 263.28, 394.86 and 80.57 is: 120.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.28 : 394.86 = 80.57 : x
  2. Step 2: Convert to fraction form
    263.28/394.86 = 80.57/x
  3. Step 3: Cross multiply
    263.28x = 394.86 × 80.57
  4. Step 4: Simplify right side
    263.28x = 31,813.87
  5. Step 5: Solve for x
    x = 31,813.87/263.28
  6. Step 6: Final answer
    x = 120.84

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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.