Home / 20,687.36-31,029.21-12,791.07

Finding the Fourth Proportional to 20,687.36, 31,029.21 and 12,791.07

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Solution

The fourth proportional to 20,687.36, 31,029.21 and 12,791.07 is: 19,185.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.36 : 31,029.21 = 12,791.07 : x
  2. Step 2: Convert to fraction form
    20,687.36/31,029.21 = 12,791.07/x
  3. Step 3: Cross multiply
    20,687.36x = 31,029.21 × 12,791.07
  4. Step 4: Simplify right side
    20,687.36x = 396,896,797.15
  5. Step 5: Solve for x
    x = 396,896,797.15/20,687.36
  6. Step 6: Final answer
    x = 19,185.48

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1.5x scale

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.