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Finding the Fourth Proportional to 13,879.53, 20,819.46 and 6,479.88

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Solution

The fourth proportional to 13,879.53, 20,819.46 and 6,479.88 is: 9,719.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.53 : 20,819.46 = 6,479.88 : x
  2. Step 2: Convert to fraction form
    13,879.53/20,819.46 = 6,479.88/x
  3. Step 3: Cross multiply
    13,879.53x = 20,819.46 × 6,479.88
  4. Step 4: Simplify right side
    13,879.53x = 134,907,602.46
  5. Step 5: Solve for x
    x = 134,907,602.46/13,879.53
  6. Step 6: Final answer
    x = 9,719.90

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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.