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Finding the Fourth Proportional to 258.83, 388.11 and 112.56

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Solution

The fourth proportional to 258.83, 388.11 and 112.56 is: 168.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.83 : 388.11 = 112.56 : x
  2. Step 2: Convert to fraction form
    258.83/388.11 = 112.56/x
  3. Step 3: Cross multiply
    258.83x = 388.11 × 112.56
  4. Step 4: Simplify right side
    258.83x = 43,685.66
  5. Step 5: Solve for x
    x = 43,685.66/258.83
  6. Step 6: Final answer
    x = 168.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.