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Finding the Fourth Proportional to 994.41, 1,372.36 and 699.78

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Solution

The fourth proportional to 994.41, 1,372.36 and 699.78 is: 965.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.41 : 1,372.36 = 699.78 : x
  2. Step 2: Convert to fraction form
    994.41/1,372.36 = 699.78/x
  3. Step 3: Cross multiply
    994.41x = 1,372.36 × 699.78
  4. Step 4: Simplify right side
    994.41x = 960,350.08
  5. Step 5: Solve for x
    x = 960,350.08/994.41
  6. Step 6: Final answer
    x = 965.75

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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.