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Finding the Fourth Proportional to 8,654.21, 12,981.31 and 2,080.39

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Solution

The fourth proportional to 8,654.21, 12,981.31 and 2,080.39 is: 3,120.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,654.21 : 12,981.31 = 2,080.39 : x
  2. Step 2: Convert to fraction form
    8,654.21/12,981.31 = 2,080.39/x
  3. Step 3: Cross multiply
    8,654.21x = 12,981.31 × 2,080.39
  4. Step 4: Simplify right side
    8,654.21x = 27,006,242.85
  5. Step 5: Solve for x
    x = 27,006,242.85/8,654.21
  6. Step 6: Final answer
    x = 3,120.59

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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.