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Finding the Fourth Proportional to 824.21, 1,236.22 and 207.92

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Solution

The fourth proportional to 824.21, 1,236.22 and 207.92 is: 311.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.21 : 1,236.22 = 207.92 : x
  2. Step 2: Convert to fraction form
    824.21/1,236.22 = 207.92/x
  3. Step 3: Cross multiply
    824.21x = 1,236.22 × 207.92
  4. Step 4: Simplify right side
    824.21x = 257,028.68
  5. Step 5: Solve for x
    x = 257,028.68/824.21
  6. Step 6: Final answer
    x = 311.85

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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.