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Finding the Fourth Proportional to 999.31, 1,379.08 and 557.27

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Solution

The fourth proportional to 999.31, 1,379.08 and 557.27 is: 769.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.31 : 1,379.08 = 557.27 : x
  2. Step 2: Convert to fraction form
    999.31/1,379.08 = 557.27/x
  3. Step 3: Cross multiply
    999.31x = 1,379.08 × 557.27
  4. Step 4: Simplify right side
    999.31x = 768,521.97
  5. Step 5: Solve for x
    x = 768,521.97/999.31
  6. Step 6: Final answer
    x = 769.05

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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.