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Finding the Fourth Proportional to 609.11, 840.44 and 388.38

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Solution

The fourth proportional to 609.11, 840.44 and 388.38 is: 535.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.11 : 840.44 = 388.38 : x
  2. Step 2: Convert to fraction form
    609.11/840.44 = 388.38/x
  3. Step 3: Cross multiply
    609.11x = 840.44 × 388.38
  4. Step 4: Simplify right side
    609.11x = 326,408.15
  5. Step 5: Solve for x
    x = 326,408.15/609.11
  6. Step 6: Final answer
    x = 535.88

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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.