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Finding the Fourth Proportional to 664.18, 994.89 and 389.44

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Solution

The fourth proportional to 664.18, 994.89 and 389.44 is: 583.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.18 : 994.89 = 389.44 : x
  2. Step 2: Convert to fraction form
    664.18/994.89 = 389.44/x
  3. Step 3: Cross multiply
    664.18x = 994.89 × 389.44
  4. Step 4: Simplify right side
    664.18x = 387,452.67
  5. Step 5: Solve for x
    x = 387,452.67/664.18
  6. Step 6: Final answer
    x = 583.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.