Home / 20,729.72-31,099.20-7,581.80

Finding the Fourth Proportional to 20,729.72, 31,099.20 and 7,581.80

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Solution

The fourth proportional to 20,729.72, 31,099.20 and 7,581.80 is: 11,374.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,729.72 : 31,099.20 = 7,581.80 : x
  2. Step 2: Convert to fraction form
    20,729.72/31,099.20 = 7,581.80/x
  3. Step 3: Cross multiply
    20,729.72x = 31,099.20 × 7,581.80
  4. Step 4: Simplify right side
    20,729.72x = 235,787,914.56
  5. Step 5: Solve for x
    x = 235,787,914.56/20,729.72
  6. Step 6: Final answer
    x = 11,374.39

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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.