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Finding the Fourth Proportional to 20,609.34, 30,825.78 and 19,115.34

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Solution

The fourth proportional to 20,609.34, 30,825.78 and 19,115.34 is: 28,591.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,609.34 : 30,825.78 = 19,115.34 : x
  2. Step 2: Convert to fraction form
    20,609.34/30,825.78 = 19,115.34/x
  3. Step 3: Cross multiply
    20,609.34x = 30,825.78 × 19,115.34
  4. Step 4: Simplify right side
    20,609.34x = 589,245,265.47
  5. Step 5: Solve for x
    x = 589,245,265.47/20,609.34
  6. Step 6: Final answer
    x = 28,591.18

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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.