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Finding the Fourth Proportional to 838.12, 1,257.20 and 221.89

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Solution

The fourth proportional to 838.12, 1,257.20 and 221.89 is: 332.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.12 : 1,257.20 = 221.89 : x
  2. Step 2: Convert to fraction form
    838.12/1,257.20 = 221.89/x
  3. Step 3: Cross multiply
    838.12x = 1,257.20 × 221.89
  4. Step 4: Simplify right side
    838.12x = 278,958.42
  5. Step 5: Solve for x
    x = 278,958.42/838.12
  6. Step 6: Final answer
    x = 332.84

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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.