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Finding the Fourth Proportional to 18,639.86, 27,964.79 and 8,112.15

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Solution

The fourth proportional to 18,639.86, 27,964.79 and 8,112.15 is: 12,170.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639.86 : 27,964.79 = 8,112.15 : x
  2. Step 2: Convert to fraction form
    18,639.86/27,964.79 = 8,112.15/x
  3. Step 3: Cross multiply
    18,639.86x = 27,964.79 × 8,112.15
  4. Step 4: Simplify right side
    18,639.86x = 226,854,390.81
  5. Step 5: Solve for x
    x = 226,854,390.81/18,639.86
  6. Step 6: Final answer
    x = 12,170.39

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1.5x scale

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.