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Finding the Fourth Proportional to 263.18, 394.65 and 80.54

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Solution

The fourth proportional to 263.18, 394.65 and 80.54 is: 120.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.18 : 394.65 = 80.54 : x
  2. Step 2: Convert to fraction form
    263.18/394.65 = 80.54/x
  3. Step 3: Cross multiply
    263.18x = 394.65 × 80.54
  4. Step 4: Simplify right side
    263.18x = 31,785.11
  5. Step 5: Solve for x
    x = 31,785.11/263.18
  6. Step 6: Final answer
    x = 120.77

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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.