Home / 20,781.19-31,171.79-5,198.82

Finding the Fourth Proportional to 20,781.19, 31,171.79 and 5,198.82

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Solution

The fourth proportional to 20,781.19, 31,171.79 and 5,198.82 is: 7,798.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.19 : 31,171.79 = 5,198.82 : x
  2. Step 2: Convert to fraction form
    20,781.19/31,171.79 = 5,198.82/x
  3. Step 3: Cross multiply
    20,781.19x = 31,171.79 × 5,198.82
  4. Step 4: Simplify right side
    20,781.19x = 162,056,525.29
  5. Step 5: Solve for x
    x = 162,056,525.29/20,781.19
  6. Step 6: Final answer
    x = 7,798.23

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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.