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Finding the Fourth Proportional to 863.21, 1,191.36 and 531.59

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Solution

The fourth proportional to 863.21, 1,191.36 and 531.59 is: 733.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.21 : 1,191.36 = 531.59 : x
  2. Step 2: Convert to fraction form
    863.21/1,191.36 = 531.59/x
  3. Step 3: Cross multiply
    863.21x = 1,191.36 × 531.59
  4. Step 4: Simplify right side
    863.21x = 633,315.06
  5. Step 5: Solve for x
    x = 633,315.06/863.21
  6. Step 6: Final answer
    x = 733.67

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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.