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Finding the Fourth Proportional to 12,080.78, 18,125.79 and 4,690.43

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Solution

The fourth proportional to 12,080.78, 18,125.79 and 4,690.43 is: 7,037.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,080.78 : 18,125.79 = 4,690.43 : x
  2. Step 2: Convert to fraction form
    12,080.78/18,125.79 = 4,690.43/x
  3. Step 3: Cross multiply
    12,080.78x = 18,125.79 × 4,690.43
  4. Step 4: Simplify right side
    12,080.78x = 85,017,766.52
  5. Step 5: Solve for x
    x = 85,017,766.52/12,080.78
  6. Step 6: Final answer
    x = 7,037.44

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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.