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Finding the Fourth Proportional to 231.57, 319.53 and 138.33

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Solution

The fourth proportional to 231.57, 319.53 and 138.33 is: 190.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.57 : 319.53 = 138.33 : x
  2. Step 2: Convert to fraction form
    231.57/319.53 = 138.33/x
  3. Step 3: Cross multiply
    231.57x = 319.53 × 138.33
  4. Step 4: Simplify right side
    231.57x = 44,200.58
  5. Step 5: Solve for x
    x = 44,200.58/231.57
  6. Step 6: Final answer
    x = 190.87

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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.