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Finding the Fourth Proportional to 8,478.86, 12,716.81 and 2,238.92

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Solution

The fourth proportional to 8,478.86, 12,716.81 and 2,238.92 is: 3,357.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,478.86 : 12,716.81 = 2,238.92 : x
  2. Step 2: Convert to fraction form
    8,478.86/12,716.81 = 2,238.92/x
  3. Step 3: Cross multiply
    8,478.86x = 12,716.81 × 2,238.92
  4. Step 4: Simplify right side
    8,478.86x = 28,471,920.25
  5. Step 5: Solve for x
    x = 28,471,920.25/8,478.86
  6. Step 6: Final answer
    x = 3,357.99

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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.