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Finding the Fourth Proportional to 994.85, 1,372.48 and 679.60

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Solution

The fourth proportional to 994.85, 1,372.48 and 679.60 is: 937.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.85 : 1,372.48 = 679.60 : x
  2. Step 2: Convert to fraction form
    994.85/1,372.48 = 679.60/x
  3. Step 3: Cross multiply
    994.85x = 1,372.48 × 679.60
  4. Step 4: Simplify right side
    994.85x = 932,734.01
  5. Step 5: Solve for x
    x = 932,734.01/994.85
  6. Step 6: Final answer
    x = 937.57

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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.