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Finding the Fourth Proportional to 12,238.12, 16,891.32 and 7,981.84

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Solution

The fourth proportional to 12,238.12, 16,891.32 and 7,981.84 is: 11,016.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,238.12 : 16,891.32 = 7,981.84 : x
  2. Step 2: Convert to fraction form
    12,238.12/16,891.32 = 7,981.84/x
  3. Step 3: Cross multiply
    12,238.12x = 16,891.32 × 7,981.84
  4. Step 4: Simplify right side
    12,238.12x = 134,823,813.63
  5. Step 5: Solve for x
    x = 134,823,813.63/12,238.12
  6. Step 6: Final answer
    x = 11,016.71

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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.