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Finding the Fourth Proportional to 863.20, 1,190.86 and 531.50

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Solution

The fourth proportional to 863.20, 1,190.86 and 531.50 is: 733.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.20 : 1,190.86 = 531.50 : x
  2. Step 2: Convert to fraction form
    863.20/1,190.86 = 531.50/x
  3. Step 3: Cross multiply
    863.20x = 1,190.86 × 531.50
  4. Step 4: Simplify right side
    863.20x = 632,942.09
  5. Step 5: Solve for x
    x = 632,942.09/863.20
  6. Step 6: Final answer
    x = 733.25

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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.