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Finding the Fourth Proportional to 994.20, 1,372.62 and 900.60

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Solution

The fourth proportional to 994.20, 1,372.62 and 900.60 is: 1,243.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.20 : 1,372.62 = 900.60 : x
  2. Step 2: Convert to fraction form
    994.20/1,372.62 = 900.60/x
  3. Step 3: Cross multiply
    994.20x = 1,372.62 × 900.60
  4. Step 4: Simplify right side
    994.20x = 1,236,181.57
  5. Step 5: Solve for x
    x = 1,236,181.57/994.20
  6. Step 6: Final answer
    x = 1,243.39

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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.