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Finding the Fourth Proportional to 281.39, 388.24 and 222.20

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Solution

The fourth proportional to 281.39, 388.24 and 222.20 is: 306.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.39 : 388.24 = 222.20 : x
  2. Step 2: Convert to fraction form
    281.39/388.24 = 222.20/x
  3. Step 3: Cross multiply
    281.39x = 388.24 × 222.20
  4. Step 4: Simplify right side
    281.39x = 86,263.88
  5. Step 5: Solve for x
    x = 86,263.88/281.39
  6. Step 6: Final answer
    x = 306.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.