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Finding the Fourth Proportional to 13,491.60, 20,228.60 and 12,109.20

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Solution

The fourth proportional to 13,491.60, 20,228.60 and 12,109.20 is: 18,155.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,491.60 : 20,228.60 = 12,109.20 : x
  2. Step 2: Convert to fraction form
    13,491.60/20,228.60 = 12,109.20/x
  3. Step 3: Cross multiply
    13,491.60x = 20,228.60 × 12,109.20
  4. Step 4: Simplify right side
    13,491.60x = 244,952,163.12
  5. Step 5: Solve for x
    x = 244,952,163.12/13,491.60
  6. Step 6: Final answer
    x = 18,155.90

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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.