Home / 20,120.10-30,180.15-12,635.70

Finding the Fourth Proportional to 20,120.10, 30,180.15 and 12,635.70

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Solution

The fourth proportional to 20,120.10, 30,180.15 and 12,635.70 is: 18,953.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,120.10 : 30,180.15 = 12,635.70 : x
  2. Step 2: Convert to fraction form
    20,120.10/30,180.15 = 12,635.70/x
  3. Step 3: Cross multiply
    20,120.10x = 30,180.15 × 12,635.70
  4. Step 4: Simplify right side
    20,120.10x = 381,347,321.36
  5. Step 5: Solve for x
    x = 381,347,321.36/20,120.10
  6. Step 6: Final answer
    x = 18,953.55

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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.