Home / 20,128.56-30,226.80-13,120.44

Finding the Fourth Proportional to 20,128.56, 30,226.80 and 13,120.44

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Solution

The fourth proportional to 20,128.56, 30,226.80 and 13,120.44 is: 19,702.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.56 : 30,226.80 = 13,120.44 : x
  2. Step 2: Convert to fraction form
    20,128.56/30,226.80 = 13,120.44/x
  3. Step 3: Cross multiply
    20,128.56x = 30,226.80 × 13,120.44
  4. Step 4: Simplify right side
    20,128.56x = 396,588,915.79
  5. Step 5: Solve for x
    x = 396,588,915.79/20,128.56
  6. Step 6: Final answer
    x = 19,702.80

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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.