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Finding the Fourth Proportional to 824.45, 1,236.79 and 276.56

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Solution

The fourth proportional to 824.45, 1,236.79 and 276.56 is: 414.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.45 : 1,236.79 = 276.56 : x
  2. Step 2: Convert to fraction form
    824.45/1,236.79 = 276.56/x
  3. Step 3: Cross multiply
    824.45x = 1,236.79 × 276.56
  4. Step 4: Simplify right side
    824.45x = 342,053.18
  5. Step 5: Solve for x
    x = 342,053.18/824.45
  6. Step 6: Final answer
    x = 414.88

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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.