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Finding the Fourth Proportional to 12,659.78, 18,989.67 and 3,425.78

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Solution

The fourth proportional to 12,659.78, 18,989.67 and 3,425.78 is: 5,138.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.78 : 18,989.67 = 3,425.78 : x
  2. Step 2: Convert to fraction form
    12,659.78/18,989.67 = 3,425.78/x
  3. Step 3: Cross multiply
    12,659.78x = 18,989.67 × 3,425.78
  4. Step 4: Simplify right side
    12,659.78x = 65,054,431.69
  5. Step 5: Solve for x
    x = 65,054,431.69/12,659.78
  6. Step 6: Final answer
    x = 5,138.67

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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.