Home / 20,142.40-30,213.60-6,990.40

Finding the Fourth Proportional to 20,142.40, 30,213.60 and 6,990.40

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Solution

The fourth proportional to 20,142.40, 30,213.60 and 6,990.40 is: 10,485.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,142.40 : 30,213.60 = 6,990.40 : x
  2. Step 2: Convert to fraction form
    20,142.40/30,213.60 = 6,990.40/x
  3. Step 3: Cross multiply
    20,142.40x = 30,213.60 × 6,990.40
  4. Step 4: Simplify right side
    20,142.40x = 211,205,149.44
  5. Step 5: Solve for x
    x = 211,205,149.44/20,142.40
  6. Step 6: Final answer
    x = 10,485.60

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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.