Home / 20,115.40-30,158.70-8,422.60

Finding the Fourth Proportional to 20,115.40, 30,158.70 and 8,422.60

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Solution

The fourth proportional to 20,115.40, 30,158.70 and 8,422.60 is: 12,627.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,115.40 : 30,158.70 = 8,422.60 : x
  2. Step 2: Convert to fraction form
    20,115.40/30,158.70 = 8,422.60/x
  3. Step 3: Cross multiply
    20,115.40x = 30,158.70 × 8,422.60
  4. Step 4: Simplify right side
    20,115.40x = 254,014,666.62
  5. Step 5: Solve for x
    x = 254,014,666.62/20,115.40
  6. Step 6: Final answer
    x = 12,627.87

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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.