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Finding the Fourth Proportional to 993.78, 1,371.39 and 551.68

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Solution

The fourth proportional to 993.78, 1,371.39 and 551.68 is: 761.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.78 : 1,371.39 = 551.68 : x
  2. Step 2: Convert to fraction form
    993.78/1,371.39 = 551.68/x
  3. Step 3: Cross multiply
    993.78x = 1,371.39 × 551.68
  4. Step 4: Simplify right side
    993.78x = 756,568.44
  5. Step 5: Solve for x
    x = 756,568.44/993.78
  6. Step 6: Final answer
    x = 761.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.