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Finding the Fourth Proportional to 318.80, 478.29 and 227.22

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Solution

The fourth proportional to 318.80, 478.29 and 227.22 is: 340.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.80 : 478.29 = 227.22 : x
  2. Step 2: Convert to fraction form
    318.80/478.29 = 227.22/x
  3. Step 3: Cross multiply
    318.80x = 478.29 × 227.22
  4. Step 4: Simplify right side
    318.80x = 108,677.05
  5. Step 5: Solve for x
    x = 108,677.05/318.80
  6. Step 6: Final answer
    x = 340.90

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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.