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Finding the Fourth Proportional to 2,151.75, 3,227.21 and 765.03

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Solution

The fourth proportional to 2,151.75, 3,227.21 and 765.03 is: 1,147.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.75 : 3,227.21 = 765.03 : x
  2. Step 2: Convert to fraction form
    2,151.75/3,227.21 = 765.03/x
  3. Step 3: Cross multiply
    2,151.75x = 3,227.21 × 765.03
  4. Step 4: Simplify right side
    2,151.75x = 2,468,912.47
  5. Step 5: Solve for x
    x = 2,468,912.47/2,151.75
  6. Step 6: Final answer
    x = 1,147.40

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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.