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Finding the Fourth Proportional to 12,379.71, 17,078.63 and 8,286.60

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Solution

The fourth proportional to 12,379.71, 17,078.63 and 8,286.60 is: 11,431.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,379.71 : 17,078.63 = 8,286.60 : x
  2. Step 2: Convert to fraction form
    12,379.71/17,078.63 = 8,286.60/x
  3. Step 3: Cross multiply
    12,379.71x = 17,078.63 × 8,286.60
  4. Step 4: Simplify right side
    12,379.71x = 141,523,775.36
  5. Step 5: Solve for x
    x = 141,523,775.36/12,379.71
  6. Step 6: Final answer
    x = 11,431.91

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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.