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Finding the Fourth Proportional to 20,489.80, 30,734.70 and 12,195.40

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Solution

The fourth proportional to 20,489.80, 30,734.70 and 12,195.40 is: 18,293.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.80 : 30,734.70 = 12,195.40 : x
  2. Step 2: Convert to fraction form
    20,489.80/30,734.70 = 12,195.40/x
  3. Step 3: Cross multiply
    20,489.80x = 30,734.70 × 12,195.40
  4. Step 4: Simplify right side
    20,489.80x = 374,821,960.38
  5. Step 5: Solve for x
    x = 374,821,960.38/20,489.80
  6. Step 6: Final answer
    x = 18,293.10

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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.