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Finding the Fourth Proportional to 13,480.64, 20,121.15 and 12,649.58

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Solution

The fourth proportional to 13,480.64, 20,121.15 and 12,649.58 is: 18,880.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,480.64 : 20,121.15 = 12,649.58 : x
  2. Step 2: Convert to fraction form
    13,480.64/20,121.15 = 12,649.58/x
  3. Step 3: Cross multiply
    13,480.64x = 20,121.15 × 12,649.58
  4. Step 4: Simplify right side
    13,480.64x = 254,524,096.62
  5. Step 5: Solve for x
    x = 254,524,096.62/13,480.64
  6. Step 6: Final answer
    x = 18,880.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.