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Finding the Fourth Proportional to 321.02, 443.20 and 210.69

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Solution

The fourth proportional to 321.02, 443.20 and 210.69 is: 290.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.02 : 443.20 = 210.69 : x
  2. Step 2: Convert to fraction form
    321.02/443.20 = 210.69/x
  3. Step 3: Cross multiply
    321.02x = 443.20 × 210.69
  4. Step 4: Simplify right side
    321.02x = 93,377.81
  5. Step 5: Solve for x
    x = 93,377.81/321.02
  6. Step 6: Final answer
    x = 290.88

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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.