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Finding the Fourth Proportional to 231.19, 346.21 and 149.78

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Solution

The fourth proportional to 231.19, 346.21 and 149.78 is: 224.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.19 : 346.21 = 149.78 : x
  2. Step 2: Convert to fraction form
    231.19/346.21 = 149.78/x
  3. Step 3: Cross multiply
    231.19x = 346.21 × 149.78
  4. Step 4: Simplify right side
    231.19x = 51,855.33
  5. Step 5: Solve for x
    x = 51,855.33/231.19
  6. Step 6: Final answer
    x = 224.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.