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Finding the Fourth Proportional to 13,879.48, 20,819.21 and 3,491.23

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Solution

The fourth proportional to 13,879.48, 20,819.21 and 3,491.23 is: 5,236.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.48 : 20,819.21 = 3,491.23 : x
  2. Step 2: Convert to fraction form
    13,879.48/20,819.21 = 3,491.23/x
  3. Step 3: Cross multiply
    13,879.48x = 20,819.21 × 3,491.23
  4. Step 4: Simplify right side
    13,879.48x = 72,684,595.87
  5. Step 5: Solve for x
    x = 72,684,595.87/13,879.48
  6. Step 6: Final answer
    x = 5,236.84

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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.