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Finding the Fourth Proportional to 20,251.10, 30,376.65 and 12,815.30

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Solution

The fourth proportional to 20,251.10, 30,376.65 and 12,815.30 is: 19,222.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,251.10 : 30,376.65 = 12,815.30 : x
  2. Step 2: Convert to fraction form
    20,251.10/30,376.65 = 12,815.30/x
  3. Step 3: Cross multiply
    20,251.10x = 30,376.65 × 12,815.30
  4. Step 4: Simplify right side
    20,251.10x = 389,285,882.75
  5. Step 5: Solve for x
    x = 389,285,882.75/20,251.10
  6. Step 6: Final answer
    x = 19,222.95

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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.