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Finding the Fourth Proportional to 231.38, 345.47 and 196.55

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Solution

The fourth proportional to 231.38, 345.47 and 196.55 is: 293.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.38 : 345.47 = 196.55 : x
  2. Step 2: Convert to fraction form
    231.38/345.47 = 196.55/x
  3. Step 3: Cross multiply
    231.38x = 345.47 × 196.55
  4. Step 4: Simplify right side
    231.38x = 67,899.42
  5. Step 5: Solve for x
    x = 67,899.42/231.38
  6. Step 6: Final answer
    x = 293.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.