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Finding the Fourth Proportional to 281.11, 388.11 and 207.30

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Solution

The fourth proportional to 281.11, 388.11 and 207.30 is: 286.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.11 : 388.11 = 207.30 : x
  2. Step 2: Convert to fraction form
    281.11/388.11 = 207.30/x
  3. Step 3: Cross multiply
    281.11x = 388.11 × 207.30
  4. Step 4: Simplify right side
    281.11x = 80,455.20
  5. Step 5: Solve for x
    x = 80,455.20/281.11
  6. Step 6: Final answer
    x = 286.21

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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.