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Finding the Fourth Proportional to 12,279.60, 18,426.60 and 4,489.20

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Solution

The fourth proportional to 12,279.60, 18,426.60 and 4,489.20 is: 6,736.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.60 : 18,426.60 = 4,489.20 : x
  2. Step 2: Convert to fraction form
    12,279.60/18,426.60 = 4,489.20/x
  3. Step 3: Cross multiply
    12,279.60x = 18,426.60 × 4,489.20
  4. Step 4: Simplify right side
    12,279.60x = 82,720,692.72
  5. Step 5: Solve for x
    x = 82,720,692.72/12,279.60
  6. Step 6: Final answer
    x = 6,736.43

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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.