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Finding the Fourth Proportional to 20,478.20, 30,659.70 and 18,404.60

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Solution

The fourth proportional to 20,478.20, 30,659.70 and 18,404.60 is: 27,555.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.20 : 30,659.70 = 18,404.60 : x
  2. Step 2: Convert to fraction form
    20,478.20/30,659.70 = 18,404.60/x
  3. Step 3: Cross multiply
    20,478.20x = 30,659.70 × 18,404.60
  4. Step 4: Simplify right side
    20,478.20x = 564,279,514.62
  5. Step 5: Solve for x
    x = 564,279,514.62/20,478.20
  6. Step 6: Final answer
    x = 27,555.13

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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.