Home / 13,581.60-20,378.04-12,491.76

Finding the Fourth Proportional to 13,581.60, 20,378.04 and 12,491.76

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Solution

The fourth proportional to 13,581.60, 20,378.04 and 12,491.76 is: 18,742.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,581.60 : 20,378.04 = 12,491.76 : x
  2. Step 2: Convert to fraction form
    13,581.60/20,378.04 = 12,491.76/x
  3. Step 3: Cross multiply
    13,581.60x = 20,378.04 × 12,491.76
  4. Step 4: Simplify right side
    13,581.60x = 254,557,584.95
  5. Step 5: Solve for x
    x = 254,557,584.95/13,581.60
  6. Step 6: Final answer
    x = 18,742.83

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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.