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Finding the Fourth Proportional to 1,331.39, 1,996.97 and 551.19

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Solution

The fourth proportional to 1,331.39, 1,996.97 and 551.19 is: 826.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.39 : 1,996.97 = 551.19 : x
  2. Step 2: Convert to fraction form
    1,331.39/1,996.97 = 551.19/x
  3. Step 3: Cross multiply
    1,331.39x = 1,996.97 × 551.19
  4. Step 4: Simplify right side
    1,331.39x = 1,100,709.89
  5. Step 5: Solve for x
    x = 1,100,709.89/1,331.39
  6. Step 6: Final answer
    x = 826.74

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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.