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Finding the Fourth Proportional to 281.25, 388.06 and 206.68

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Solution

The fourth proportional to 281.25, 388.06 and 206.68 is: 285.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.25 : 388.06 = 206.68 : x
  2. Step 2: Convert to fraction form
    281.25/388.06 = 206.68/x
  3. Step 3: Cross multiply
    281.25x = 388.06 × 206.68
  4. Step 4: Simplify right side
    281.25x = 80,202.56
  5. Step 5: Solve for x
    x = 80,202.56/281.25
  6. Step 6: Final answer
    x = 285.17

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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.