Home / 12,489.21-18,736.89-4,170.12

Finding the Fourth Proportional to 12,489.21, 18,736.89 and 4,170.12

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Solution

The fourth proportional to 12,489.21, 18,736.89 and 4,170.12 is: 6,256.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.21 : 18,736.89 = 4,170.12 : x
  2. Step 2: Convert to fraction form
    12,489.21/18,736.89 = 4,170.12/x
  3. Step 3: Cross multiply
    12,489.21x = 18,736.89 × 4,170.12
  4. Step 4: Simplify right side
    12,489.21x = 78,135,079.73
  5. Step 5: Solve for x
    x = 78,135,079.73/12,489.21
  6. Step 6: Final answer
    x = 6,256.21

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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.