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Finding the Fourth Proportional to 1,420.88, 1,960.64 and 799.84

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Solution

The fourth proportional to 1,420.88, 1,960.64 and 799.84 is: 1,103.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.88 : 1,960.64 = 799.84 : x
  2. Step 2: Convert to fraction form
    1,420.88/1,960.64 = 799.84/x
  3. Step 3: Cross multiply
    1,420.88x = 1,960.64 × 799.84
  4. Step 4: Simplify right side
    1,420.88x = 1,568,198.30
  5. Step 5: Solve for x
    x = 1,568,198.30/1,420.88
  6. Step 6: Final answer
    x = 1,103.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.