Home / 20,791.15-31,189.32-8,139.27

Finding the Fourth Proportional to 20,791.15, 31,189.32 and 8,139.27

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Solution

The fourth proportional to 20,791.15, 31,189.32 and 8,139.27 is: 12,209.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.15 : 31,189.32 = 8,139.27 : x
  2. Step 2: Convert to fraction form
    20,791.15/31,189.32 = 8,139.27/x
  3. Step 3: Cross multiply
    20,791.15x = 31,189.32 × 8,139.27
  4. Step 4: Simplify right side
    20,791.15x = 253,858,373.99
  5. Step 5: Solve for x
    x = 253,858,373.99/20,791.15
  6. Step 6: Final answer
    x = 12,209.92

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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.