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Finding the Fourth Proportional to 20,626.30, 30,939.42 and 7,478.64

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Solution

The fourth proportional to 20,626.30, 30,939.42 and 7,478.64 is: 11,217.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,626.30 : 30,939.42 = 7,478.64 : x
  2. Step 2: Convert to fraction form
    20,626.30/30,939.42 = 7,478.64/x
  3. Step 3: Cross multiply
    20,626.30x = 30,939.42 × 7,478.64
  4. Step 4: Simplify right side
    20,626.30x = 231,384,783.99
  5. Step 5: Solve for x
    x = 231,384,783.99/20,626.30
  6. Step 6: Final answer
    x = 11,217.95

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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.