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Finding the Fourth Proportional to 20,138.60, 30,207.90 and 18,842.60

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Solution

The fourth proportional to 20,138.60, 30,207.90 and 18,842.60 is: 28,263.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.60 : 30,207.90 = 18,842.60 : x
  2. Step 2: Convert to fraction form
    20,138.60/30,207.90 = 18,842.60/x
  3. Step 3: Cross multiply
    20,138.60x = 30,207.90 × 18,842.60
  4. Step 4: Simplify right side
    20,138.60x = 569,195,376.54
  5. Step 5: Solve for x
    x = 569,195,376.54/20,138.60
  6. Step 6: Final answer
    x = 28,263.90

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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.