Home / 20,722.30-31,083.41-5,139.92

Finding the Fourth Proportional to 20,722.30, 31,083.41 and 5,139.92

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Solution

The fourth proportional to 20,722.30, 31,083.41 and 5,139.92 is: 7,709.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,722.30 : 31,083.41 = 5,139.92 : x
  2. Step 2: Convert to fraction form
    20,722.30/31,083.41 = 5,139.92/x
  3. Step 3: Cross multiply
    20,722.30x = 31,083.41 × 5,139.92
  4. Step 4: Simplify right side
    20,722.30x = 159,766,331.29
  5. Step 5: Solve for x
    x = 159,766,331.29/20,722.30
  6. Step 6: Final answer
    x = 7,709.88

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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.