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Finding the Fourth Proportional to 863.36, 1,292.64 and 658.80

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Solution

The fourth proportional to 863.36, 1,292.64 and 658.80 is: 986.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.36 : 1,292.64 = 658.80 : x
  2. Step 2: Convert to fraction form
    863.36/1,292.64 = 658.80/x
  3. Step 3: Cross multiply
    863.36x = 1,292.64 × 658.80
  4. Step 4: Simplify right side
    863.36x = 851,591.23
  5. Step 5: Solve for x
    x = 851,591.23/863.36
  6. Step 6: Final answer
    x = 986.37

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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.