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Finding the Fourth Proportional to 20,606.20, 30,895.80 and 8,118.70

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Solution

The fourth proportional to 20,606.20, 30,895.80 and 8,118.70 is: 12,172.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,606.20 : 30,895.80 = 8,118.70 : x
  2. Step 2: Convert to fraction form
    20,606.20/30,895.80 = 8,118.70/x
  3. Step 3: Cross multiply
    20,606.20x = 30,895.80 × 8,118.70
  4. Step 4: Simplify right side
    20,606.20x = 250,833,731.46
  5. Step 5: Solve for x
    x = 250,833,731.46/20,606.20
  6. Step 6: Final answer
    x = 12,172.73

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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.