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Finding the Fourth Proportional to 321.91, 444.15 and 211.55

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Solution

The fourth proportional to 321.91, 444.15 and 211.55 is: 291.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.91 : 444.15 = 211.55 : x
  2. Step 2: Convert to fraction form
    321.91/444.15 = 211.55/x
  3. Step 3: Cross multiply
    321.91x = 444.15 × 211.55
  4. Step 4: Simplify right side
    321.91x = 93,957.71
  5. Step 5: Solve for x
    x = 93,957.71/321.91
  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.