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Finding the Fourth Proportional to 20,591.20, 30,872.40 and 8,106.40

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Solution

The fourth proportional to 20,591.20, 30,872.40 and 8,106.40 is: 12,153.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,591.20 : 30,872.40 = 8,106.40 : x
  2. Step 2: Convert to fraction form
    20,591.20/30,872.40 = 8,106.40/x
  3. Step 3: Cross multiply
    20,591.20x = 30,872.40 × 8,106.40
  4. Step 4: Simplify right side
    20,591.20x = 250,264,023.36
  5. Step 5: Solve for x
    x = 250,264,023.36/20,591.20
  6. Step 6: Final answer
    x = 12,153.93

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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.