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Finding the Fourth Proportional to 20,267.60, 30,401.40 and 12,480.80

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Solution

The fourth proportional to 20,267.60, 30,401.40 and 12,480.80 is: 18,721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,267.60 : 30,401.40 = 12,480.80 : x
  2. Step 2: Convert to fraction form
    20,267.60/30,401.40 = 12,480.80/x
  3. Step 3: Cross multiply
    20,267.60x = 30,401.40 × 12,480.80
  4. Step 4: Simplify right side
    20,267.60x = 379,433,793.12
  5. Step 5: Solve for x
    x = 379,433,793.12/20,267.60
  6. Step 6: Final answer
    x = 18,721.20

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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.