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Finding the Fourth Proportional to 281.67, 388.46 and 208.17

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Solution

The fourth proportional to 281.67, 388.46 and 208.17 is: 287.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.67 : 388.46 = 208.17 : x
  2. Step 2: Convert to fraction form
    281.67/388.46 = 208.17/x
  3. Step 3: Cross multiply
    281.67x = 388.46 × 208.17
  4. Step 4: Simplify right side
    281.67x = 80,864.68
  5. Step 5: Solve for x
    x = 80,864.68/281.67
  6. Step 6: Final answer
    x = 287.09

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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.