Home / 12,121.10-18,138.45-8,405.90

Finding the Fourth Proportional to 12,121.10, 18,138.45 and 8,405.90

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Solution

The fourth proportional to 12,121.10, 18,138.45 and 8,405.90 is: 12,578.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,121.10 : 18,138.45 = 8,405.90 : x
  2. Step 2: Convert to fraction form
    12,121.10/18,138.45 = 8,405.90/x
  3. Step 3: Cross multiply
    12,121.10x = 18,138.45 × 8,405.90
  4. Step 4: Simplify right side
    12,121.10x = 152,469,996.86
  5. Step 5: Solve for x
    x = 152,469,996.86/12,121.10
  6. Step 6: Final answer
    x = 12,578.89

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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.