Home / 13,982.20-20,930.10-8,121.40

Finding the Fourth Proportional to 13,982.20, 20,930.10 and 8,121.40

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Solution

The fourth proportional to 13,982.20, 20,930.10 and 8,121.40 is: 12,157.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,982.20 : 20,930.10 = 8,121.40 : x
  2. Step 2: Convert to fraction form
    13,982.20/20,930.10 = 8,121.40/x
  3. Step 3: Cross multiply
    13,982.20x = 20,930.10 × 8,121.40
  4. Step 4: Simplify right side
    13,982.20x = 169,981,714.14
  5. Step 5: Solve for x
    x = 169,981,714.14/13,982.20
  6. Step 6: Final answer
    x = 12,157.01

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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.