Home / 20,120.60-30,180.90-5,331.80

Finding the Fourth Proportional to 20,120.60, 30,180.90 and 5,331.80

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Solution

The fourth proportional to 20,120.60, 30,180.90 and 5,331.80 is: 7,997.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120.60 : 30,180.90 = 5,331.80 : x
  2. Step 2: Convert to fraction form
    20,120.60/30,180.90 = 5,331.80/x
  3. Step 3: Cross multiply
    20,120.60x = 30,180.90 × 5,331.80
  4. Step 4: Simplify right side
    20,120.60x = 160,918,522.62
  5. Step 5: Solve for x
    x = 160,918,522.62/20,120.60
  6. Step 6: Final answer
    x = 7,997.70

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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.