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Finding the Fourth Proportional to 758.96, 1,138.92 and 394.40

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Solution

The fourth proportional to 758.96, 1,138.92 and 394.40 is: 591.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.96 : 1,138.92 = 394.40 : x
  2. Step 2: Convert to fraction form
    758.96/1,138.92 = 394.40/x
  3. Step 3: Cross multiply
    758.96x = 1,138.92 × 394.40
  4. Step 4: Simplify right side
    758.96x = 449,190.05
  5. Step 5: Solve for x
    x = 449,190.05/758.96
  6. Step 6: Final answer
    x = 591.85

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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.