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Finding the Fourth Proportional to 994.33, 1,372.81 and 640.38

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Solution

The fourth proportional to 994.33, 1,372.81 and 640.38 is: 884.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.33 : 1,372.81 = 640.38 : x
  2. Step 2: Convert to fraction form
    994.33/1,372.81 = 640.38/x
  3. Step 3: Cross multiply
    994.33x = 1,372.81 × 640.38
  4. Step 4: Simplify right side
    994.33x = 879,116.87
  5. Step 5: Solve for x
    x = 879,116.87/994.33
  6. Step 6: Final answer
    x = 884.13

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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.