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Finding the Fourth Proportional to 1,331.64, 1,996.60 and 551.43

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Solution

The fourth proportional to 1,331.64, 1,996.60 and 551.43 is: 826.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.64 : 1,996.60 = 551.43 : x
  2. Step 2: Convert to fraction form
    1,331.64/1,996.60 = 551.43/x
  3. Step 3: Cross multiply
    1,331.64x = 1,996.60 × 551.43
  4. Step 4: Simplify right side
    1,331.64x = 1,100,982.38
  5. Step 5: Solve for x
    x = 1,100,982.38/1,331.64
  6. Step 6: Final answer
    x = 826.79

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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.