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Finding the Fourth Proportional to 939.12, 1,408.48 and 604.57

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Solution

The fourth proportional to 939.12, 1,408.48 and 604.57 is: 906.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.12 : 1,408.48 = 604.57 : x
  2. Step 2: Convert to fraction form
    939.12/1,408.48 = 604.57/x
  3. Step 3: Cross multiply
    939.12x = 1,408.48 × 604.57
  4. Step 4: Simplify right side
    939.12x = 851,524.75
  5. Step 5: Solve for x
    x = 851,524.75/939.12
  6. Step 6: Final answer
    x = 906.73

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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.