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Finding the Fourth Proportional to 18,664.80, 27,959.36 and 8,655.44

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Solution

The fourth proportional to 18,664.80, 27,959.36 and 8,655.44 is: 12,965.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,664.80 : 27,959.36 = 8,655.44 : x
  2. Step 2: Convert to fraction form
    18,664.80/27,959.36 = 8,655.44/x
  3. Step 3: Cross multiply
    18,664.80x = 27,959.36 × 8,655.44
  4. Step 4: Simplify right side
    18,664.80x = 242,000,562.92
  5. Step 5: Solve for x
    x = 242,000,562.92/18,664.80
  6. Step 6: Final answer
    x = 12,965.61

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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.