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Finding the Fourth Proportional to 759.20, 1,138.84 and 211.39

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Solution

The fourth proportional to 759.20, 1,138.84 and 211.39 is: 317.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.20 : 1,138.84 = 211.39 : x
  2. Step 2: Convert to fraction form
    759.20/1,138.84 = 211.39/x
  3. Step 3: Cross multiply
    759.20x = 1,138.84 × 211.39
  4. Step 4: Simplify right side
    759.20x = 240,736.01
  5. Step 5: Solve for x
    x = 240,736.01/759.20
  6. Step 6: Final answer
    x = 317.09

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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.