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Finding the Fourth Proportional to 996.11, 1,374.78 and 717.26

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Solution

The fourth proportional to 996.11, 1,374.78 and 717.26 is: 989.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.11 : 1,374.78 = 717.26 : x
  2. Step 2: Convert to fraction form
    996.11/1,374.78 = 717.26/x
  3. Step 3: Cross multiply
    996.11x = 1,374.78 × 717.26
  4. Step 4: Simplify right side
    996.11x = 986,074.70
  5. Step 5: Solve for x
    x = 986,074.70/996.11
  6. Step 6: Final answer
    x = 989.93

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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.