Home / 13,321.80-19,958.40-8,121.60

Finding the Fourth Proportional to 13,321.80, 19,958.40 and 8,121.60

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Solution

The fourth proportional to 13,321.80, 19,958.40 and 8,121.60 is: 12,167.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,321.80 : 19,958.40 = 8,121.60 : x
  2. Step 2: Convert to fraction form
    13,321.80/19,958.40 = 8,121.60/x
  3. Step 3: Cross multiply
    13,321.80x = 19,958.40 × 8,121.60
  4. Step 4: Simplify right side
    13,321.80x = 162,094,141.44
  5. Step 5: Solve for x
    x = 162,094,141.44/13,321.80
  6. Step 6: Final answer
    x = 12,167.59

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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.