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Finding the Fourth Proportional to 842.15, 1,261.83 and 516.82

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Solution

The fourth proportional to 842.15, 1,261.83 and 516.82 is: 774.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.15 : 1,261.83 = 516.82 : x
  2. Step 2: Convert to fraction form
    842.15/1,261.83 = 516.82/x
  3. Step 3: Cross multiply
    842.15x = 1,261.83 × 516.82
  4. Step 4: Simplify right side
    842.15x = 652,138.98
  5. Step 5: Solve for x
    x = 652,138.98/842.15
  6. Step 6: Final answer
    x = 774.37

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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.