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Finding the Fourth Proportional to 18,958.83, 28,438.32 and 5,811.15

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Solution

The fourth proportional to 18,958.83, 28,438.32 and 5,811.15 is: 8,716.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,958.83 : 28,438.32 = 5,811.15 : x
  2. Step 2: Convert to fraction form
    18,958.83/28,438.32 = 5,811.15/x
  3. Step 3: Cross multiply
    18,958.83x = 28,438.32 × 5,811.15
  4. Step 4: Simplify right side
    18,958.83x = 165,259,343.27
  5. Step 5: Solve for x
    x = 165,259,343.27/18,958.83
  6. Step 6: Final answer
    x = 8,716.75

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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.