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Finding the Fourth Proportional to 824.73, 1,236.78 and 276.78

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Solution

The fourth proportional to 824.73, 1,236.78 and 276.78 is: 415.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.73 : 1,236.78 = 276.78 : x
  2. Step 2: Convert to fraction form
    824.73/1,236.78 = 276.78/x
  3. Step 3: Cross multiply
    824.73x = 1,236.78 × 276.78
  4. Step 4: Simplify right side
    824.73x = 342,315.97
  5. Step 5: Solve for x
    x = 342,315.97/824.73
  6. Step 6: Final answer
    x = 415.07

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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.