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Finding the Fourth Proportional to 20,161.80, 30,238.74 and 19,161.62

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Solution

The fourth proportional to 20,161.80, 30,238.74 and 19,161.62 is: 28,738.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,161.80 : 30,238.74 = 19,161.62 : x
  2. Step 2: Convert to fraction form
    20,161.80/30,238.74 = 19,161.62/x
  3. Step 3: Cross multiply
    20,161.80x = 30,238.74 × 19,161.62
  4. Step 4: Simplify right side
    20,161.80x = 579,423,245.16
  5. Step 5: Solve for x
    x = 579,423,245.16/20,161.80
  6. Step 6: Final answer
    x = 28,738.67

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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.