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Finding the Fourth Proportional to 231.69, 319.78 and 148.84

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Solution

The fourth proportional to 231.69, 319.78 and 148.84 is: 205.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.69 : 319.78 = 148.84 : x
  2. Step 2: Convert to fraction form
    231.69/319.78 = 148.84/x
  3. Step 3: Cross multiply
    231.69x = 319.78 × 148.84
  4. Step 4: Simplify right side
    231.69x = 47,594.88
  5. Step 5: Solve for x
    x = 47,594.88/231.69
  6. Step 6: Final answer
    x = 205.42

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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.