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Finding the Fourth Proportional to 13,939.92, 20,913.56 and 8,090.92

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Solution

The fourth proportional to 13,939.92, 20,913.56 and 8,090.92 is: 12,138.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,939.92 : 20,913.56 = 8,090.92 : x
  2. Step 2: Convert to fraction form
    13,939.92/20,913.56 = 8,090.92/x
  3. Step 3: Cross multiply
    13,939.92x = 20,913.56 × 8,090.92
  4. Step 4: Simplify right side
    13,939.92x = 169,209,940.88
  5. Step 5: Solve for x
    x = 169,209,940.88/13,939.92
  6. Step 6: Final answer
    x = 12,138.52

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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.