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Finding the Fourth Proportional to 321.21, 443.80 and 285.93

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Solution

The fourth proportional to 321.21, 443.80 and 285.93 is: 395.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.21 : 443.80 = 285.93 : x
  2. Step 2: Convert to fraction form
    321.21/443.80 = 285.93/x
  3. Step 3: Cross multiply
    321.21x = 443.80 × 285.93
  4. Step 4: Simplify right side
    321.21x = 126,893.52
  5. Step 5: Solve for x
    x = 126,893.52/321.21
  6. Step 6: Final answer
    x = 395.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.