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Finding the Fourth Proportional to 871.92, 1,305.27 and 667.26

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Solution

The fourth proportional to 871.92, 1,305.27 and 667.26 is: 998.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.92 : 1,305.27 = 667.26 : x
  2. Step 2: Convert to fraction form
    871.92/1,305.27 = 667.26/x
  3. Step 3: Cross multiply
    871.92x = 1,305.27 × 667.26
  4. Step 4: Simplify right side
    871.92x = 870,954.46
  5. Step 5: Solve for x
    x = 870,954.46/871.92
  6. Step 6: Final answer
    x = 998.89

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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.