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Finding the Fourth Proportional to 996.78, 1,375.56 and 554.74

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Solution

The fourth proportional to 996.78, 1,375.56 and 554.74 is: 765.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.78 : 1,375.56 = 554.74 : x
  2. Step 2: Convert to fraction form
    996.78/1,375.56 = 554.74/x
  3. Step 3: Cross multiply
    996.78x = 1,375.56 × 554.74
  4. Step 4: Simplify right side
    996.78x = 763,078.15
  5. Step 5: Solve for x
    x = 763,078.15/996.78
  6. Step 6: Final answer
    x = 765.54

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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.