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Finding the Fourth Proportional to 1,611.34, 2,416.98 and 515.78

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Solution

The fourth proportional to 1,611.34, 2,416.98 and 515.78 is: 773.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.34 : 2,416.98 = 515.78 : x
  2. Step 2: Convert to fraction form
    1,611.34/2,416.98 = 515.78/x
  3. Step 3: Cross multiply
    1,611.34x = 2,416.98 × 515.78
  4. Step 4: Simplify right side
    1,611.34x = 1,246,629.94
  5. Step 5: Solve for x
    x = 1,246,629.94/1,611.34
  6. Step 6: Final answer
    x = 773.66

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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.