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Finding the Fourth Proportional to 263.25, 394.93 and 80.66

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Solution

The fourth proportional to 263.25, 394.93 and 80.66 is: 121.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.25 : 394.93 = 80.66 : x
  2. Step 2: Convert to fraction form
    263.25/394.93 = 80.66/x
  3. Step 3: Cross multiply
    263.25x = 394.93 × 80.66
  4. Step 4: Simplify right side
    263.25x = 31,855.05
  5. Step 5: Solve for x
    x = 31,855.05/263.25
  6. Step 6: Final answer
    x = 121.01

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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.