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Finding the Fourth Proportional to 231.55, 319.45 and 138.19

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Solution

The fourth proportional to 231.55, 319.45 and 138.19 is: 190.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.55 : 319.45 = 138.19 : x
  2. Step 2: Convert to fraction form
    231.55/319.45 = 138.19/x
  3. Step 3: Cross multiply
    231.55x = 319.45 × 138.19
  4. Step 4: Simplify right side
    231.55x = 44,144.80
  5. Step 5: Solve for x
    x = 44,144.80/231.55
  6. Step 6: Final answer
    x = 190.65

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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.