Home / 20,751.28-31,124.72-8,272.96

Finding the Fourth Proportional to 20,751.28, 31,124.72 and 8,272.96

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Solution

The fourth proportional to 20,751.28, 31,124.72 and 8,272.96 is: 12,408.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751.28 : 31,124.72 = 8,272.96 : x
  2. Step 2: Convert to fraction form
    20,751.28/31,124.72 = 8,272.96/x
  3. Step 3: Cross multiply
    20,751.28x = 31,124.72 × 8,272.96
  4. Step 4: Simplify right side
    20,751.28x = 257,493,563.57
  5. Step 5: Solve for x
    x = 257,493,563.57/20,751.28
  6. Step 6: Final answer
    x = 12,408.56

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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.