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Finding the Fourth Proportional to 239.65, 357.71 and 222.28

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Solution

The fourth proportional to 239.65, 357.71 and 222.28 is: 331.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.65 : 357.71 = 222.28 : x
  2. Step 2: Convert to fraction form
    239.65/357.71 = 222.28/x
  3. Step 3: Cross multiply
    239.65x = 357.71 × 222.28
  4. Step 4: Simplify right side
    239.65x = 79,511.78
  5. Step 5: Solve for x
    x = 79,511.78/239.65
  6. Step 6: Final answer
    x = 331.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.