Home / 20,128.25-27,778.20-12,172.43

Finding the Fourth Proportional to 20,128.25, 27,778.20 and 12,172.43

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Solution

The fourth proportional to 20,128.25, 27,778.20 and 12,172.43 is: 16,798.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.25 : 27,778.20 = 12,172.43 : x
  2. Step 2: Convert to fraction form
    20,128.25/27,778.20 = 12,172.43/x
  3. Step 3: Cross multiply
    20,128.25x = 27,778.20 × 12,172.43
  4. Step 4: Simplify right side
    20,128.25x = 338,128,195.03
  5. Step 5: Solve for x
    x = 338,128,195.03/20,128.25
  6. Step 6: Final answer
    x = 16,798.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.