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Finding the Fourth Proportional to 13,608.20, 20,412.30 and 12,139.40

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Solution

The fourth proportional to 13,608.20, 20,412.30 and 12,139.40 is: 18,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,608.20 : 20,412.30 = 12,139.40 : x
  2. Step 2: Convert to fraction form
    13,608.20/20,412.30 = 12,139.40/x
  3. Step 3: Cross multiply
    13,608.20x = 20,412.30 × 12,139.40
  4. Step 4: Simplify right side
    13,608.20x = 247,793,074.62
  5. Step 5: Solve for x
    x = 247,793,074.62/13,608.20
  6. Step 6: Final answer
    x = 18,209.10

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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.