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Finding the Fourth Proportional to 881.09, 1,321.94 and 551.66

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Solution

The fourth proportional to 881.09, 1,321.94 and 551.66 is: 827.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.09 : 1,321.94 = 551.66 : x
  2. Step 2: Convert to fraction form
    881.09/1,321.94 = 551.66/x
  3. Step 3: Cross multiply
    881.09x = 1,321.94 × 551.66
  4. Step 4: Simplify right side
    881.09x = 729,252.05
  5. Step 5: Solve for x
    x = 729,252.05/881.09
  6. Step 6: Final answer
    x = 827.68

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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.