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Finding the Fourth Proportional to 823.71, 1,234.30 and 548.81

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Solution

The fourth proportional to 823.71, 1,234.30 and 548.81 is: 822.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.71 : 1,234.30 = 548.81 : x
  2. Step 2: Convert to fraction form
    823.71/1,234.30 = 548.81/x
  3. Step 3: Cross multiply
    823.71x = 1,234.30 × 548.81
  4. Step 4: Simplify right side
    823.71x = 677,391.73
  5. Step 5: Solve for x
    x = 677,391.73/823.71
  6. Step 6: Final answer
    x = 822.36

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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.