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Finding the Fourth Proportional to 999.33, 1,379.31 and 667.89

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Solution

The fourth proportional to 999.33, 1,379.31 and 667.89 is: 921.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.33 : 1,379.31 = 667.89 : x
  2. Step 2: Convert to fraction form
    999.33/1,379.31 = 667.89/x
  3. Step 3: Cross multiply
    999.33x = 1,379.31 × 667.89
  4. Step 4: Simplify right side
    999.33x = 921,227.36
  5. Step 5: Solve for x
    x = 921,227.36/999.33
  6. Step 6: Final answer
    x = 921.84

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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.