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Finding the Fourth Proportional to 13,939.60, 20,925.60 and 8,399.20

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Solution

The fourth proportional to 13,939.60, 20,925.60 and 8,399.20 is: 12,608.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,939.60 : 20,925.60 = 8,399.20 : x
  2. Step 2: Convert to fraction form
    13,939.60/20,925.60 = 8,399.20/x
  3. Step 3: Cross multiply
    13,939.60x = 20,925.60 × 8,399.20
  4. Step 4: Simplify right side
    13,939.60x = 175,758,299.52
  5. Step 5: Solve for x
    x = 175,758,299.52/13,939.60
  6. Step 6: Final answer
    x = 12,608.56

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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.