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Finding the Fourth Proportional to 996.81, 1,375.48 and 554.66

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Solution

The fourth proportional to 996.81, 1,375.48 and 554.66 is: 765.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.81 : 1,375.48 = 554.66 : x
  2. Step 2: Convert to fraction form
    996.81/1,375.48 = 554.66/x
  3. Step 3: Cross multiply
    996.81x = 1,375.48 × 554.66
  4. Step 4: Simplify right side
    996.81x = 762,923.74
  5. Step 5: Solve for x
    x = 762,923.74/996.81
  6. Step 6: Final answer
    x = 765.37

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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.