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Finding the Fourth Proportional to 823.88, 1,234.92 and 618.86

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Solution

The fourth proportional to 823.88, 1,234.92 and 618.86 is: 927.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.88 : 1,234.92 = 618.86 : x
  2. Step 2: Convert to fraction form
    823.88/1,234.92 = 618.86/x
  3. Step 3: Cross multiply
    823.88x = 1,234.92 × 618.86
  4. Step 4: Simplify right side
    823.88x = 764,242.59
  5. Step 5: Solve for x
    x = 764,242.59/823.88
  6. Step 6: Final answer
    x = 927.61

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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.