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Finding the Fourth Proportional to 263.28, 394.96 and 80.66

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Solution

The fourth proportional to 263.28, 394.96 and 80.66 is: 121.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.28 : 394.96 = 80.66 : x
  2. Step 2: Convert to fraction form
    263.28/394.96 = 80.66/x
  3. Step 3: Cross multiply
    263.28x = 394.96 × 80.66
  4. Step 4: Simplify right side
    263.28x = 31,857.47
  5. Step 5: Solve for x
    x = 31,857.47/263.28
  6. Step 6: Final answer
    x = 121.00

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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.