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Finding the Fourth Proportional to 321.15, 481.54 and 218.57

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Solution

The fourth proportional to 321.15, 481.54 and 218.57 is: 327.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.15 : 481.54 = 218.57 : x
  2. Step 2: Convert to fraction form
    321.15/481.54 = 218.57/x
  3. Step 3: Cross multiply
    321.15x = 481.54 × 218.57
  4. Step 4: Simplify right side
    321.15x = 105,248.45
  5. Step 5: Solve for x
    x = 105,248.45/321.15
  6. Step 6: Final answer
    x = 327.73

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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.