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Finding the Fourth Proportional to 1,998.43, 2,997.68 and 765.90

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Solution

The fourth proportional to 1,998.43, 2,997.68 and 765.90 is: 1,148.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.43 : 2,997.68 = 765.90 : x
  2. Step 2: Convert to fraction form
    1,998.43/2,997.68 = 765.90/x
  3. Step 3: Cross multiply
    1,998.43x = 2,997.68 × 765.90
  4. Step 4: Simplify right side
    1,998.43x = 2,295,926.78
  5. Step 5: Solve for x
    x = 2,295,926.78/1,998.43
  6. Step 6: Final answer
    x = 1,148.87

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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.