Home / 20,128.10-30,206.55-8,449.70

Finding the Fourth Proportional to 20,128.10, 30,206.55 and 8,449.70

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Solution

The fourth proportional to 20,128.10, 30,206.55 and 8,449.70 is: 12,680.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.10 : 30,206.55 = 8,449.70 : x
  2. Step 2: Convert to fraction form
    20,128.10/30,206.55 = 8,449.70/x
  3. Step 3: Cross multiply
    20,128.10x = 30,206.55 × 8,449.70
  4. Step 4: Simplify right side
    20,128.10x = 255,236,285.54
  5. Step 5: Solve for x
    x = 255,236,285.54/20,128.10
  6. Step 6: Final answer
    x = 12,680.60

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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.