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Finding the Fourth Proportional to 20,415.20, 30,622.80 and 8,729.60

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Solution

The fourth proportional to 20,415.20, 30,622.80 and 8,729.60 is: 13,094.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,415.20 : 30,622.80 = 8,729.60 : x
  2. Step 2: Convert to fraction form
    20,415.20/30,622.80 = 8,729.60/x
  3. Step 3: Cross multiply
    20,415.20x = 30,622.80 × 8,729.60
  4. Step 4: Simplify right side
    20,415.20x = 267,324,794.88
  5. Step 5: Solve for x
    x = 267,324,794.88/20,415.20
  6. Step 6: Final answer
    x = 13,094.40

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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.