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Finding the Fourth Proportional to 824.38, 1,236.21 and 247.12

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Solution

The fourth proportional to 824.38, 1,236.21 and 247.12 is: 370.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.38 : 1,236.21 = 247.12 : x
  2. Step 2: Convert to fraction form
    824.38/1,236.21 = 247.12/x
  3. Step 3: Cross multiply
    824.38x = 1,236.21 × 247.12
  4. Step 4: Simplify right side
    824.38x = 305,493.76
  5. Step 5: Solve for x
    x = 305,493.76/824.38
  6. Step 6: Final answer
    x = 370.57

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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.