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Finding the Fourth Proportional to 8,611.90, 12,919.20 and 3,681.56

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Solution

The fourth proportional to 8,611.90, 12,919.20 and 3,681.56 is: 5,522.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.90 : 12,919.20 = 3,681.56 : x
  2. Step 2: Convert to fraction form
    8,611.90/12,919.20 = 3,681.56/x
  3. Step 3: Cross multiply
    8,611.90x = 12,919.20 × 3,681.56
  4. Step 4: Simplify right side
    8,611.90x = 47,562,828.44
  5. Step 5: Solve for x
    x = 47,562,828.44/8,611.90
  6. Step 6: Final answer
    x = 5,522.92

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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.