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Finding the Fourth Proportional to 321.33, 443.28 and 210.81

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Solution

The fourth proportional to 321.33, 443.28 and 210.81 is: 290.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.33 : 443.28 = 210.81 : x
  2. Step 2: Convert to fraction form
    321.33/443.28 = 210.81/x
  3. Step 3: Cross multiply
    321.33x = 443.28 × 210.81
  4. Step 4: Simplify right side
    321.33x = 93,447.86
  5. Step 5: Solve for x
    x = 93,447.86/321.33
  6. Step 6: Final answer
    x = 290.82

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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.