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Finding the Fourth Proportional to 321.55, 443.85 and 190.55

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Solution

The fourth proportional to 321.55, 443.85 and 190.55 is: 263.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.55 : 443.85 = 190.55 : x
  2. Step 2: Convert to fraction form
    321.55/443.85 = 190.55/x
  3. Step 3: Cross multiply
    321.55x = 443.85 × 190.55
  4. Step 4: Simplify right side
    321.55x = 84,576.01
  5. Step 5: Solve for x
    x = 84,576.01/321.55
  6. Step 6: Final answer
    x = 263.03

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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.