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Finding the Fourth Proportional to 12,120.52, 18,180.74 and 3,912.52

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Solution

The fourth proportional to 12,120.52, 18,180.74 and 3,912.52 is: 5,868.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,120.52 : 18,180.74 = 3,912.52 : x
  2. Step 2: Convert to fraction form
    12,120.52/18,180.74 = 3,912.52/x
  3. Step 3: Cross multiply
    12,120.52x = 18,180.74 × 3,912.52
  4. Step 4: Simplify right side
    12,120.52x = 71,132,508.86
  5. Step 5: Solve for x
    x = 71,132,508.86/12,120.52
  6. Step 6: Final answer
    x = 5,868.77

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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.