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Finding the Fourth Proportional to 321.45, 443.59 and 203.40

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Solution

The fourth proportional to 321.45, 443.59 and 203.40 is: 280.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.45 : 443.59 = 203.40 : x
  2. Step 2: Convert to fraction form
    321.45/443.59 = 203.40/x
  3. Step 3: Cross multiply
    321.45x = 443.59 × 203.40
  4. Step 4: Simplify right side
    321.45x = 90,226.21
  5. Step 5: Solve for x
    x = 90,226.21/321.45
  6. Step 6: Final answer
    x = 280.69

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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.