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Finding the Fourth Proportional to 824.73, 1,236.28 and 392.19

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Solution

The fourth proportional to 824.73, 1,236.28 and 392.19 is: 587.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.73 : 1,236.28 = 392.19 : x
  2. Step 2: Convert to fraction form
    824.73/1,236.28 = 392.19/x
  3. Step 3: Cross multiply
    824.73x = 1,236.28 × 392.19
  4. Step 4: Simplify right side
    824.73x = 484,856.65
  5. Step 5: Solve for x
    x = 484,856.65/824.73
  6. Step 6: Final answer
    x = 587.90

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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.