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Finding the Fourth Proportional to 724, 1,086.18 and 211

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Solution

The fourth proportional to 724, 1,086.18 and 211 is: 316.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    724 : 1,086.18 = 211 : x
  2. Step 2: Convert to fraction form
    724/1,086.18 = 211/x
  3. Step 3: Cross multiply
    724x = 1,086.18 × 211
  4. Step 4: Simplify right side
    724x = 229,183.98
  5. Step 5: Solve for x
    x = 229,183.98/724
  6. Step 6: Final answer
    x = 316.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.