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Finding the Fourth Proportional to 321.79, 444.23 and 211.43

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Solution

The fourth proportional to 321.79, 444.23 and 211.43 is: 291.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.79 : 444.23 = 211.43 : x
  2. Step 2: Convert to fraction form
    321.79/444.23 = 211.43/x
  3. Step 3: Cross multiply
    321.79x = 444.23 × 211.43
  4. Step 4: Simplify right side
    321.79x = 93,923.55
  5. Step 5: Solve for x
    x = 93,923.55/321.79
  6. Step 6: Final answer
    x = 291.88

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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.