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Finding the Fourth Proportional to 8,611.60, 11,880.95 and 5,629.15

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Solution

The fourth proportional to 8,611.60, 11,880.95 and 5,629.15 is: 7,766.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.60 : 11,880.95 = 5,629.15 : x
  2. Step 2: Convert to fraction form
    8,611.60/11,880.95 = 5,629.15/x
  3. Step 3: Cross multiply
    8,611.60x = 11,880.95 × 5,629.15
  4. Step 4: Simplify right side
    8,611.60x = 66,879,649.69
  5. Step 5: Solve for x
    x = 66,879,649.69/8,611.60
  6. Step 6: Final answer
    x = 7,766.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.