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Finding the Fourth Proportional to 867.20, 1,299.39 and 520.37

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Solution

The fourth proportional to 867.20, 1,299.39 and 520.37 is: 779.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.20 : 1,299.39 = 520.37 : x
  2. Step 2: Convert to fraction form
    867.20/1,299.39 = 520.37/x
  3. Step 3: Cross multiply
    867.20x = 1,299.39 × 520.37
  4. Step 4: Simplify right side
    867.20x = 676,163.57
  5. Step 5: Solve for x
    x = 676,163.57/867.20
  6. Step 6: Final answer
    x = 779.71

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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.