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Finding the Fourth Proportional to 20,672.60, 31,008.90 and 6,819.80

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Solution

The fourth proportional to 20,672.60, 31,008.90 and 6,819.80 is: 10,229.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.60 : 31,008.90 = 6,819.80 : x
  2. Step 2: Convert to fraction form
    20,672.60/31,008.90 = 6,819.80/x
  3. Step 3: Cross multiply
    20,672.60x = 31,008.90 × 6,819.80
  4. Step 4: Simplify right side
    20,672.60x = 211,474,496.22
  5. Step 5: Solve for x
    x = 211,474,496.22/20,672.60
  6. Step 6: Final answer
    x = 10,229.70

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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.