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Finding the Fourth Proportional to 13,730.89, 20,697.85 and 12,928.20

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Solution

The fourth proportional to 13,730.89, 20,697.85 and 12,928.20 is: 19,487.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,730.89 : 20,697.85 = 12,928.20 : x
  2. Step 2: Convert to fraction form
    13,730.89/20,697.85 = 12,928.20/x
  3. Step 3: Cross multiply
    13,730.89x = 20,697.85 × 12,928.20
  4. Step 4: Simplify right side
    13,730.89x = 267,585,944.37
  5. Step 5: Solve for x
    x = 267,585,944.37/13,730.89
  6. Step 6: Final answer
    x = 19,487.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.