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Finding the Fourth Proportional to 759.94, 1,138.51 and 394.34

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Solution

The fourth proportional to 759.94, 1,138.51 and 394.34 is: 590.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.94 : 1,138.51 = 394.34 : x
  2. Step 2: Convert to fraction form
    759.94/1,138.51 = 394.34/x
  3. Step 3: Cross multiply
    759.94x = 1,138.51 × 394.34
  4. Step 4: Simplify right side
    759.94x = 448,960.03
  5. Step 5: Solve for x
    x = 448,960.03/759.94
  6. Step 6: Final answer
    x = 590.78

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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.