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Finding the Fourth Proportional to 231.54, 319.36 and 203.80

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Solution

The fourth proportional to 231.54, 319.36 and 203.80 is: 281.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.54 : 319.36 = 203.80 : x
  2. Step 2: Convert to fraction form
    231.54/319.36 = 203.80/x
  3. Step 3: Cross multiply
    231.54x = 319.36 × 203.80
  4. Step 4: Simplify right side
    231.54x = 65,085.57
  5. Step 5: Solve for x
    x = 65,085.57/231.54
  6. Step 6: Final answer
    x = 281.10

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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.