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Finding the Fourth Proportional to 8,611.21, 12,918.17 and 3,680.88

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Solution

The fourth proportional to 8,611.21, 12,918.17 and 3,680.88 is: 5,521.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.21 : 12,918.17 = 3,680.88 : x
  2. Step 2: Convert to fraction form
    8,611.21/12,918.17 = 3,680.88/x
  3. Step 3: Cross multiply
    8,611.21x = 12,918.17 × 3,680.88
  4. Step 4: Simplify right side
    8,611.21x = 47,550,233.59
  5. Step 5: Solve for x
    x = 47,550,233.59/8,611.21
  6. Step 6: Final answer
    x = 5,521.90

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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.