Home / 20,321.20-30,482.60-7,171.68

Finding the Fourth Proportional to 20,321.20, 30,482.60 and 7,171.68

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Solution

The fourth proportional to 20,321.20, 30,482.60 and 7,171.68 is: 10,757.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,321.20 : 30,482.60 = 7,171.68 : x
  2. Step 2: Convert to fraction form
    20,321.20/30,482.60 = 7,171.68/x
  3. Step 3: Cross multiply
    20,321.20x = 30,482.60 × 7,171.68
  4. Step 4: Simplify right side
    20,321.20x = 218,611,452.77
  5. Step 5: Solve for x
    x = 218,611,452.77/20,321.20
  6. Step 6: Final answer
    x = 10,757.80

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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.