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Finding the Fourth Proportional to 863.10, 1,190.61 and 513.54

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Solution

The fourth proportional to 863.10, 1,190.61 and 513.54 is: 708.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.10 : 1,190.61 = 513.54 : x
  2. Step 2: Convert to fraction form
    863.10/1,190.61 = 513.54/x
  3. Step 3: Cross multiply
    863.10x = 1,190.61 × 513.54
  4. Step 4: Simplify right side
    863.10x = 611,425.86
  5. Step 5: Solve for x
    x = 611,425.86/863.10
  6. Step 6: Final answer
    x = 708.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.