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Finding the Fourth Proportional to 13,908.64, 20,863.08 and 11,128.42

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Solution

The fourth proportional to 13,908.64, 20,863.08 and 11,128.42 is: 16,692.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,908.64 : 20,863.08 = 11,128.42 : x
  2. Step 2: Convert to fraction form
    13,908.64/20,863.08 = 11,128.42/x
  3. Step 3: Cross multiply
    13,908.64x = 20,863.08 × 11,128.42
  4. Step 4: Simplify right side
    13,908.64x = 232,173,116.73
  5. Step 5: Solve for x
    x = 232,173,116.73/13,908.64
  6. Step 6: Final answer
    x = 16,692.73

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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.