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Finding the Fourth Proportional to 12,399.88, 17,100.12 and 8,143.44

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Solution

The fourth proportional to 12,399.88, 17,100.12 and 8,143.44 is: 11,230.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,399.88 : 17,100.12 = 8,143.44 : x
  2. Step 2: Convert to fraction form
    12,399.88/17,100.12 = 8,143.44/x
  3. Step 3: Cross multiply
    12,399.88x = 17,100.12 × 8,143.44
  4. Step 4: Simplify right side
    12,399.88x = 139,253,801.21
  5. Step 5: Solve for x
    x = 139,253,801.21/12,399.88
  6. Step 6: Final answer
    x = 11,230.25

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.