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Finding the Fourth Proportional to 759.09, 1,138.71 and 203.79

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Solution

The fourth proportional to 759.09, 1,138.71 and 203.79 is: 305.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.09 : 1,138.71 = 203.79 : x
  2. Step 2: Convert to fraction form
    759.09/1,138.71 = 203.79/x
  3. Step 3: Cross multiply
    759.09x = 1,138.71 × 203.79
  4. Step 4: Simplify right side
    759.09x = 232,057.71
  5. Step 5: Solve for x
    x = 232,057.71/759.09
  6. Step 6: Final answer
    x = 305.71

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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.