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Finding the Fourth Proportional to 311.34, 467.19 and 258.69

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Solution

The fourth proportional to 311.34, 467.19 and 258.69 is: 388.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.34 : 467.19 = 258.69 : x
  2. Step 2: Convert to fraction form
    311.34/467.19 = 258.69/x
  3. Step 3: Cross multiply
    311.34x = 467.19 × 258.69
  4. Step 4: Simplify right side
    311.34x = 120,857.38
  5. Step 5: Solve for x
    x = 120,857.38/311.34
  6. Step 6: Final answer
    x = 388.18

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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.