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Finding the Fourth Proportional to 281.34, 388.06 and 215.73

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Solution

The fourth proportional to 281.34, 388.06 and 215.73 is: 297.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.34 : 388.06 = 215.73 : x
  2. Step 2: Convert to fraction form
    281.34/388.06 = 215.73/x
  3. Step 3: Cross multiply
    281.34x = 388.06 × 215.73
  4. Step 4: Simplify right side
    281.34x = 83,716.18
  5. Step 5: Solve for x
    x = 83,716.18/281.34
  6. Step 6: Final answer
    x = 297.56

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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.