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Finding the Fourth Proportional to 994.01, 1,372.35 and 640.11

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Solution

The fourth proportional to 994.01, 1,372.35 and 640.11 is: 883.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.01 : 1,372.35 = 640.11 : x
  2. Step 2: Convert to fraction form
    994.01/1,372.35 = 640.11/x
  3. Step 3: Cross multiply
    994.01x = 1,372.35 × 640.11
  4. Step 4: Simplify right side
    994.01x = 878,452.21
  5. Step 5: Solve for x
    x = 878,452.21/994.01
  6. Step 6: Final answer
    x = 883.75

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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.