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Finding the Fourth Proportional to 321.40, 443.58 and 190.42

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Solution

The fourth proportional to 321.40, 443.58 and 190.42 is: 262.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.40 : 443.58 = 190.42 : x
  2. Step 2: Convert to fraction form
    321.40/443.58 = 190.42/x
  3. Step 3: Cross multiply
    321.40x = 443.58 × 190.42
  4. Step 4: Simplify right side
    321.40x = 84,466.50
  5. Step 5: Solve for x
    x = 84,466.50/321.40
  6. Step 6: Final answer
    x = 262.81

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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.