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Finding the Fourth Proportional to 263.36, 394.94 and 80.70

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Solution

The fourth proportional to 263.36, 394.94 and 80.70 is: 121.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.36 : 394.94 = 80.70 : x
  2. Step 2: Convert to fraction form
    263.36/394.94 = 80.70/x
  3. Step 3: Cross multiply
    263.36x = 394.94 × 80.70
  4. Step 4: Simplify right side
    263.36x = 31,871.66
  5. Step 5: Solve for x
    x = 31,871.66/263.36
  6. Step 6: Final answer
    x = 121.02

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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.