Home / 13,720.20-20,580.30-8,179.80

Finding the Fourth Proportional to 13,720.20, 20,580.30 and 8,179.80

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Solution

The fourth proportional to 13,720.20, 20,580.30 and 8,179.80 is: 12,269.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.20 : 20,580.30 = 8,179.80 : x
  2. Step 2: Convert to fraction form
    13,720.20/20,580.30 = 8,179.80/x
  3. Step 3: Cross multiply
    13,720.20x = 20,580.30 × 8,179.80
  4. Step 4: Simplify right side
    13,720.20x = 168,342,737.94
  5. Step 5: Solve for x
    x = 168,342,737.94/13,720.20
  6. Step 6: Final answer
    x = 12,269.70

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1.5x scale

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.