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Finding the Fourth Proportional to 20,138.60, 30,207.90 and 18,826.40

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Solution

The fourth proportional to 20,138.60, 30,207.90 and 18,826.40 is: 28,239.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.60 : 30,207.90 = 18,826.40 : x
  2. Step 2: Convert to fraction form
    20,138.60/30,207.90 = 18,826.40/x
  3. Step 3: Cross multiply
    20,138.60x = 30,207.90 × 18,826.40
  4. Step 4: Simplify right side
    20,138.60x = 568,706,008.56
  5. Step 5: Solve for x
    x = 568,706,008.56/20,138.60
  6. Step 6: Final answer
    x = 28,239.60

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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.