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Finding the Fourth Proportional to 1,611.21, 2,416.61 and 515.60

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Solution

The fourth proportional to 1,611.21, 2,416.61 and 515.60 is: 773.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.21 : 2,416.61 = 515.60 : x
  2. Step 2: Convert to fraction form
    1,611.21/2,416.61 = 515.60/x
  3. Step 3: Cross multiply
    1,611.21x = 2,416.61 × 515.60
  4. Step 4: Simplify right side
    1,611.21x = 1,245,989.45
  5. Step 5: Solve for x
    x = 1,245,989.45/1,611.21
  6. Step 6: Final answer
    x = 773.33

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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.