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Finding the Fourth Proportional to 2,151.62, 3,226.52 and 765.31

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Solution

The fourth proportional to 2,151.62, 3,226.52 and 765.31 is: 1,147.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.62 : 3,226.52 = 765.31 : x
  2. Step 2: Convert to fraction form
    2,151.62/3,226.52 = 765.31/x
  3. Step 3: Cross multiply
    2,151.62x = 3,226.52 × 765.31
  4. Step 4: Simplify right side
    2,151.62x = 2,469,277.77
  5. Step 5: Solve for x
    x = 2,469,277.77/2,151.62
  6. Step 6: Final answer
    x = 1,147.64

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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.