Home / 20,819.28-31,228.96-5,236.80

Finding the Fourth Proportional to 20,819.28, 31,228.96 and 5,236.80

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Solution

The fourth proportional to 20,819.28, 31,228.96 and 5,236.80 is: 7,855.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.28 : 31,228.96 = 5,236.80 : x
  2. Step 2: Convert to fraction form
    20,819.28/31,228.96 = 5,236.80/x
  3. Step 3: Cross multiply
    20,819.28x = 31,228.96 × 5,236.80
  4. Step 4: Simplify right side
    20,819.28x = 163,539,817.73
  5. Step 5: Solve for x
    x = 163,539,817.73/20,819.28
  6. Step 6: Final answer
    x = 7,855.21

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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.