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Finding the Fourth Proportional to 321.75, 443.61 and 282.80

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Solution

The fourth proportional to 321.75, 443.61 and 282.80 is: 389.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.75 : 443.61 = 282.80 : x
  2. Step 2: Convert to fraction form
    321.75/443.61 = 282.80/x
  3. Step 3: Cross multiply
    321.75x = 443.61 × 282.80
  4. Step 4: Simplify right side
    321.75x = 125,454.02
  5. Step 5: Solve for x
    x = 125,454.02/321.75
  6. Step 6: Final answer
    x = 389.91

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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.