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Finding the Fourth Proportional to 18,919.12, 28,396.17 and 9,565.72

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Solution

The fourth proportional to 18,919.12, 28,396.17 and 9,565.72 is: 14,357.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.12 : 28,396.17 = 9,565.72 : x
  2. Step 2: Convert to fraction form
    18,919.12/28,396.17 = 9,565.72/x
  3. Step 3: Cross multiply
    18,919.12x = 28,396.17 × 9,565.72
  4. Step 4: Simplify right side
    18,919.12x = 271,629,811.29
  5. Step 5: Solve for x
    x = 271,629,811.29/18,919.12
  6. Step 6: Final answer
    x = 14,357.42

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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.