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Finding the Fourth Proportional to 20,139.60, 30,209.40 and 12,352.80

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Solution

The fourth proportional to 20,139.60, 30,209.40 and 12,352.80 is: 18,529.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.60 : 30,209.40 = 12,352.80 : x
  2. Step 2: Convert to fraction form
    20,139.60/30,209.40 = 12,352.80/x
  3. Step 3: Cross multiply
    20,139.60x = 30,209.40 × 12,352.80
  4. Step 4: Simplify right side
    20,139.60x = 373,170,676.32
  5. Step 5: Solve for x
    x = 373,170,676.32/20,139.60
  6. Step 6: Final answer
    x = 18,529.20

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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.