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Finding the Fourth Proportional to 18,716.80, 25,831 and 13,992.88

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Solution

The fourth proportional to 18,716.80, 25,831 and 13,992.88 is: 19,311.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,716.80 : 25,831 = 13,992.88 : x
  2. Step 2: Convert to fraction form
    18,716.80/25,831 = 13,992.88/x
  3. Step 3: Cross multiply
    18,716.80x = 25,831 × 13,992.88
  4. Step 4: Simplify right side
    18,716.80x = 361,450,083.28
  5. Step 5: Solve for x
    x = 361,450,083.28/18,716.80
  6. Step 6: Final answer
    x = 19,311.53

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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.