Home / 20,775.24-31,156.38-6,921

Finding the Fourth Proportional to 20,775.24, 31,156.38 and 6,921

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Solution

The fourth proportional to 20,775.24, 31,156.38 and 6,921 is: 10,379.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,775.24 : 31,156.38 = 6,921 : x
  2. Step 2: Convert to fraction form
    20,775.24/31,156.38 = 6,921/x
  3. Step 3: Cross multiply
    20,775.24x = 31,156.38 × 6,921
  4. Step 4: Simplify right side
    20,775.24x = 215,633,305.98
  5. Step 5: Solve for x
    x = 215,633,305.98/20,775.24
  6. Step 6: Final answer
    x = 10,379.34

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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.