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Finding the Fourth Proportional to 312.20, 467.90 and 155.85

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Solution

The fourth proportional to 312.20, 467.90 and 155.85 is: 233.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.20 : 467.90 = 155.85 : x
  2. Step 2: Convert to fraction form
    312.20/467.90 = 155.85/x
  3. Step 3: Cross multiply
    312.20x = 467.90 × 155.85
  4. Step 4: Simplify right side
    312.20x = 72,922.22
  5. Step 5: Solve for x
    x = 72,922.22/312.20
  6. Step 6: Final answer
    x = 233.58

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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.