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Finding the Fourth Proportional to 998.67, 1,377.78 and 605.55

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Solution

The fourth proportional to 998.67, 1,377.78 and 605.55 is: 835.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.67 : 1,377.78 = 605.55 : x
  2. Step 2: Convert to fraction form
    998.67/1,377.78 = 605.55/x
  3. Step 3: Cross multiply
    998.67x = 1,377.78 × 605.55
  4. Step 4: Simplify right side
    998.67x = 834,314.68
  5. Step 5: Solve for x
    x = 834,314.68/998.67
  6. Step 6: Final answer
    x = 835.43

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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.