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Finding the Fourth Proportional to 667.03, 994.84 and 643.81

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Solution

The fourth proportional to 667.03, 994.84 and 643.81 is: 960.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.03 : 994.84 = 643.81 : x
  2. Step 2: Convert to fraction form
    667.03/994.84 = 643.81/x
  3. Step 3: Cross multiply
    667.03x = 994.84 × 643.81
  4. Step 4: Simplify right side
    667.03x = 640,487.94
  5. Step 5: Solve for x
    x = 640,487.94/667.03
  6. Step 6: Final answer
    x = 960.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.