Home / 1,421.27-1,961.39-791.84

Finding the Fourth Proportional to 1,421.27, 1,961.39 and 791.84

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Solution

The fourth proportional to 1,421.27, 1,961.39 and 791.84 is: 1,092.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.27 : 1,961.39 = 791.84 : x
  2. Step 2: Convert to fraction form
    1,421.27/1,961.39 = 791.84/x
  3. Step 3: Cross multiply
    1,421.27x = 1,961.39 × 791.84
  4. Step 4: Simplify right side
    1,421.27x = 1,553,107.06
  5. Step 5: Solve for x
    x = 1,553,107.06/1,421.27
  6. Step 6: Final answer
    x = 1,092.76

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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.