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Finding the Fourth Proportional to 318.21, 476.79 and 226.77

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Solution

The fourth proportional to 318.21, 476.79 and 226.77 is: 339.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.21 : 476.79 = 226.77 : x
  2. Step 2: Convert to fraction form
    318.21/476.79 = 226.77/x
  3. Step 3: Cross multiply
    318.21x = 476.79 × 226.77
  4. Step 4: Simplify right side
    318.21x = 108,121.67
  5. Step 5: Solve for x
    x = 108,121.67/318.21
  6. Step 6: Final answer
    x = 339.78

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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.