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Finding the Fourth Proportional to 999.28, 1,379 and 557.18

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Solution

The fourth proportional to 999.28, 1,379 and 557.18 is: 768.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.28 : 1,379 = 557.18 : x
  2. Step 2: Convert to fraction form
    999.28/1,379 = 557.18/x
  3. Step 3: Cross multiply
    999.28x = 1,379 × 557.18
  4. Step 4: Simplify right side
    999.28x = 768,351.22
  5. Step 5: Solve for x
    x = 768,351.22/999.28
  6. Step 6: Final answer
    x = 768.90

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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.