Home / 1,421.31-1,961.40-791.87

Finding the Fourth Proportional to 1,421.31, 1,961.40 and 791.87

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Solution

The fourth proportional to 1,421.31, 1,961.40 and 791.87 is: 1,092.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.31 : 1,961.40 = 791.87 : x
  2. Step 2: Convert to fraction form
    1,421.31/1,961.40 = 791.87/x
  3. Step 3: Cross multiply
    1,421.31x = 1,961.40 × 791.87
  4. Step 4: Simplify right side
    1,421.31x = 1,553,164.01
  5. Step 5: Solve for x
    x = 1,553,164.01/1,421.31
  6. Step 6: Final answer
    x = 1,092.77

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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.