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Finding the Fourth Proportional to 8,611.75, 12,919.79 and 2,455.75

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Solution

The fourth proportional to 8,611.75, 12,919.79 and 2,455.75 is: 3,684.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.75 : 12,919.79 = 2,455.75 : x
  2. Step 2: Convert to fraction form
    8,611.75/12,919.79 = 2,455.75/x
  3. Step 3: Cross multiply
    8,611.75x = 12,919.79 × 2,455.75
  4. Step 4: Simplify right side
    8,611.75x = 31,727,774.29
  5. Step 5: Solve for x
    x = 31,727,774.29/8,611.75
  6. Step 6: Final answer
    x = 3,684.24

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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.