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Finding the Fourth Proportional to 321.89, 443.19 and 283.99

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Solution

The fourth proportional to 321.89, 443.19 and 283.99 is: 391.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.89 : 443.19 = 283.99 : x
  2. Step 2: Convert to fraction form
    321.89/443.19 = 283.99/x
  3. Step 3: Cross multiply
    321.89x = 443.19 × 283.99
  4. Step 4: Simplify right side
    321.89x = 125,862.08
  5. Step 5: Solve for x
    x = 125,862.08/321.89
  6. Step 6: Final answer
    x = 391.01

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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.