Home / 1,421.21-1,961.28-791.75

Finding the Fourth Proportional to 1,421.21, 1,961.28 and 791.75

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Solution

The fourth proportional to 1,421.21, 1,961.28 and 791.75 is: 1,092.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.21 : 1,961.28 = 791.75 : x
  2. Step 2: Convert to fraction form
    1,421.21/1,961.28 = 791.75/x
  3. Step 3: Cross multiply
    1,421.21x = 1,961.28 × 791.75
  4. Step 4: Simplify right side
    1,421.21x = 1,552,833.63
  5. Step 5: Solve for x
    x = 1,552,833.63/1,421.21
  6. Step 6: Final answer
    x = 1,092.62

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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.