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Finding the Fourth Proportional to 5,611.60, 8,422.80 and 4,790.80

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Solution

The fourth proportional to 5,611.60, 8,422.80 and 4,790.80 is: 7,190.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,611.60 : 8,422.80 = 4,790.80 : x
  2. Step 2: Convert to fraction form
    5,611.60/8,422.80 = 4,790.80/x
  3. Step 3: Cross multiply
    5,611.60x = 8,422.80 × 4,790.80
  4. Step 4: Simplify right side
    5,611.60x = 40,351,950.24
  5. Step 5: Solve for x
    x = 40,351,950.24/5,611.60
  6. Step 6: Final answer
    x = 7,190.81

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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.