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Finding the Fourth Proportional to 759.25, 1,138.68 and 272.31

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Solution

The fourth proportional to 759.25, 1,138.68 and 272.31 is: 408.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.25 : 1,138.68 = 272.31 : x
  2. Step 2: Convert to fraction form
    759.25/1,138.68 = 272.31/x
  3. Step 3: Cross multiply
    759.25x = 1,138.68 × 272.31
  4. Step 4: Simplify right side
    759.25x = 310,069.68
  5. Step 5: Solve for x
    x = 310,069.68/759.25
  6. Step 6: Final answer
    x = 408.39

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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.