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Finding the Fourth Proportional to 312.31, 467.86 and 257.55

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Solution

The fourth proportional to 312.31, 467.86 and 257.55 is: 385.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.31 : 467.86 = 257.55 : x
  2. Step 2: Convert to fraction form
    312.31/467.86 = 257.55/x
  3. Step 3: Cross multiply
    312.31x = 467.86 × 257.55
  4. Step 4: Simplify right side
    312.31x = 120,497.34
  5. Step 5: Solve for x
    x = 120,497.34/312.31
  6. Step 6: Final answer
    x = 385.83

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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.