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Finding the Fourth Proportional to 8,389.78, 12,585.13 and 2,149.84

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Solution

The fourth proportional to 8,389.78, 12,585.13 and 2,149.84 is: 3,224.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,389.78 : 12,585.13 = 2,149.84 : x
  2. Step 2: Convert to fraction form
    8,389.78/12,585.13 = 2,149.84/x
  3. Step 3: Cross multiply
    8,389.78x = 12,585.13 × 2,149.84
  4. Step 4: Simplify right side
    8,389.78x = 27,056,026.24
  5. Step 5: Solve for x
    x = 27,056,026.24/8,389.78
  6. Step 6: Final answer
    x = 3,224.88

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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.