Home / 20,105.40-30,157.91-5,112.55

Finding the Fourth Proportional to 20,105.40, 30,157.91 and 5,112.55

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Solution

The fourth proportional to 20,105.40, 30,157.91 and 5,112.55 is: 7,668.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,105.40 : 30,157.91 = 5,112.55 : x
  2. Step 2: Convert to fraction form
    20,105.40/30,157.91 = 5,112.55/x
  3. Step 3: Cross multiply
    20,105.40x = 30,157.91 × 5,112.55
  4. Step 4: Simplify right side
    20,105.40x = 154,183,873.25
  5. Step 5: Solve for x
    x = 154,183,873.25/20,105.40
  6. Step 6: Final answer
    x = 7,668.78

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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.