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Finding the Fourth Proportional to 13,928.64, 20,912.40 and 12,170.40

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Solution

The fourth proportional to 13,928.64, 20,912.40 and 12,170.40 is: 18,272.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,928.64 : 20,912.40 = 12,170.40 : x
  2. Step 2: Convert to fraction form
    13,928.64/20,912.40 = 12,170.40/x
  3. Step 3: Cross multiply
    13,928.64x = 20,912.40 × 12,170.40
  4. Step 4: Simplify right side
    13,928.64x = 254,512,272.96
  5. Step 5: Solve for x
    x = 254,512,272.96/13,928.64
  6. Step 6: Final answer
    x = 18,272.59

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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.