Home / 20,768.90-31,157.40-8,286.80

Finding the Fourth Proportional to 20,768.90, 31,157.40 and 8,286.80

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Solution

The fourth proportional to 20,768.90, 31,157.40 and 8,286.80 is: 12,431.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,768.90 : 31,157.40 = 8,286.80 : x
  2. Step 2: Convert to fraction form
    20,768.90/31,157.40 = 8,286.80/x
  3. Step 3: Cross multiply
    20,768.90x = 31,157.40 × 8,286.80
  4. Step 4: Simplify right side
    20,768.90x = 258,195,142.32
  5. Step 5: Solve for x
    x = 258,195,142.32/20,768.90
  6. Step 6: Final answer
    x = 12,431.82

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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.