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Finding the Fourth Proportional to 321.75, 443.49 and 266.40

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Solution

The fourth proportional to 321.75, 443.49 and 266.40 is: 367.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.75 : 443.49 = 266.40 : x
  2. Step 2: Convert to fraction form
    321.75/443.49 = 266.40/x
  3. Step 3: Cross multiply
    321.75x = 443.49 × 266.40
  4. Step 4: Simplify right side
    321.75x = 118,145.74
  5. Step 5: Solve for x
    x = 118,145.74/321.75
  6. Step 6: Final answer
    x = 367.20

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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.