Home / 13,620.89-20,429.79-3,761.57

Finding the Fourth Proportional to 13,620.89, 20,429.79 and 3,761.57

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Solution

The fourth proportional to 13,620.89, 20,429.79 and 3,761.57 is: 5,641.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.89 : 20,429.79 = 3,761.57 : x
  2. Step 2: Convert to fraction form
    13,620.89/20,429.79 = 3,761.57/x
  3. Step 3: Cross multiply
    13,620.89x = 20,429.79 × 3,761.57
  4. Step 4: Simplify right side
    13,620.89x = 76,847,983.02
  5. Step 5: Solve for x
    x = 76,847,983.02/13,620.89
  6. Step 6: Final answer
    x = 5,641.92

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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.