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Finding the Fourth Proportional to 203.89, 281.48 and 137.85

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Solution

The fourth proportional to 203.89, 281.48 and 137.85 is: 190.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.89 : 281.48 = 137.85 : x
  2. Step 2: Convert to fraction form
    203.89/281.48 = 137.85/x
  3. Step 3: Cross multiply
    203.89x = 281.48 × 137.85
  4. Step 4: Simplify right side
    203.89x = 38,802.02
  5. Step 5: Solve for x
    x = 38,802.02/203.89
  6. Step 6: Final answer
    x = 190.31

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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.