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Finding the Fourth Proportional to 281.70, 388.17 and 207.90

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Solution

The fourth proportional to 281.70, 388.17 and 207.90 is: 286.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.70 : 388.17 = 207.90 : x
  2. Step 2: Convert to fraction form
    281.70/388.17 = 207.90/x
  3. Step 3: Cross multiply
    281.70x = 388.17 × 207.90
  4. Step 4: Simplify right side
    281.70x = 80,700.54
  5. Step 5: Solve for x
    x = 80,700.54/281.70
  6. Step 6: Final answer
    x = 286.48

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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.