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Finding the Fourth Proportional to 20,207.60, 30,311.40 and 12,420.80

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Solution

The fourth proportional to 20,207.60, 30,311.40 and 12,420.80 is: 18,631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,207.60 : 30,311.40 = 12,420.80 : x
  2. Step 2: Convert to fraction form
    20,207.60/30,311.40 = 12,420.80/x
  3. Step 3: Cross multiply
    20,207.60x = 30,311.40 × 12,420.80
  4. Step 4: Simplify right side
    20,207.60x = 376,491,837.12
  5. Step 5: Solve for x
    x = 376,491,837.12/20,207.60
  6. Step 6: Final answer
    x = 18,631.20

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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.