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Finding the Fourth Proportional to 999.44, 1,379.19 and 557.42

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Solution

The fourth proportional to 999.44, 1,379.19 and 557.42 is: 769.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.44 : 1,379.19 = 557.42 : x
  2. Step 2: Convert to fraction form
    999.44/1,379.19 = 557.42/x
  3. Step 3: Cross multiply
    999.44x = 1,379.19 × 557.42
  4. Step 4: Simplify right side
    999.44x = 768,788.09
  5. Step 5: Solve for x
    x = 768,788.09/999.44
  6. Step 6: Final answer
    x = 769.22

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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.