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Finding the Fourth Proportional to 321.12, 481.95 and 191.25

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Solution

The fourth proportional to 321.12, 481.95 and 191.25 is: 287.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.12 : 481.95 = 191.25 : x
  2. Step 2: Convert to fraction form
    321.12/481.95 = 191.25/x
  3. Step 3: Cross multiply
    321.12x = 481.95 × 191.25
  4. Step 4: Simplify right side
    321.12x = 92,172.94
  5. Step 5: Solve for x
    x = 92,172.94/321.12
  6. Step 6: Final answer
    x = 287.04

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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.