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Finding the Fourth Proportional to 994.10, 1,372.51 and 679.25

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Solution

The fourth proportional to 994.10, 1,372.51 and 679.25 is: 937.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.10 : 1,372.51 = 679.25 : x
  2. Step 2: Convert to fraction form
    994.10/1,372.51 = 679.25/x
  3. Step 3: Cross multiply
    994.10x = 1,372.51 × 679.25
  4. Step 4: Simplify right side
    994.10x = 932,277.42
  5. Step 5: Solve for x
    x = 932,277.42/994.10
  6. Step 6: Final answer
    x = 937.81

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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.