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Finding the Fourth Proportional to 1,611.75, 2,417.67 and 516.21

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Solution

The fourth proportional to 1,611.75, 2,417.67 and 516.21 is: 774.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.75 : 2,417.67 = 516.21 : x
  2. Step 2: Convert to fraction form
    1,611.75/2,417.67 = 516.21/x
  3. Step 3: Cross multiply
    1,611.75x = 2,417.67 × 516.21
  4. Step 4: Simplify right side
    1,611.75x = 1,248,025.43
  5. Step 5: Solve for x
    x = 1,248,025.43/1,611.75
  6. Step 6: Final answer
    x = 774.33

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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.