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Finding the Fourth Proportional to 1,612.75, 2,419.17 and 517.21

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Solution

The fourth proportional to 1,612.75, 2,419.17 and 517.21 is: 775.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,612.75 : 2,419.17 = 517.21 : x
  2. Step 2: Convert to fraction form
    1,612.75/2,419.17 = 517.21/x
  3. Step 3: Cross multiply
    1,612.75x = 2,419.17 × 517.21
  4. Step 4: Simplify right side
    1,612.75x = 1,251,218.92
  5. Step 5: Solve for x
    x = 1,251,218.92/1,612.75
  6. Step 6: Final answer
    x = 775.83

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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.