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Finding the Fourth Proportional to 321.18, 443.21 and 210.69

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Solution

The fourth proportional to 321.18, 443.21 and 210.69 is: 290.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.18 : 443.21 = 210.69 : x
  2. Step 2: Convert to fraction form
    321.18/443.21 = 210.69/x
  3. Step 3: Cross multiply
    321.18x = 443.21 × 210.69
  4. Step 4: Simplify right side
    321.18x = 93,379.91
  5. Step 5: Solve for x
    x = 93,379.91/321.18
  6. Step 6: Final answer
    x = 290.74

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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.