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Finding the Fourth Proportional to 8,611.36, 12,918.08 and 2,765.92

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Solution

The fourth proportional to 8,611.36, 12,918.08 and 2,765.92 is: 4,149.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.36 : 12,918.08 = 2,765.92 : x
  2. Step 2: Convert to fraction form
    8,611.36/12,918.08 = 2,765.92/x
  3. Step 3: Cross multiply
    8,611.36x = 12,918.08 × 2,765.92
  4. Step 4: Simplify right side
    8,611.36x = 35,730,375.83
  5. Step 5: Solve for x
    x = 35,730,375.83/8,611.36
  6. Step 6: Final answer
    x = 4,149.21

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1.5x scale

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.