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Finding the Fourth Proportional to 999.88, 1,379.64 and 580.11

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Solution

The fourth proportional to 999.88, 1,379.64 and 580.11 is: 800.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.88 : 1,379.64 = 580.11 : x
  2. Step 2: Convert to fraction form
    999.88/1,379.64 = 580.11/x
  3. Step 3: Cross multiply
    999.88x = 1,379.64 × 580.11
  4. Step 4: Simplify right side
    999.88x = 800,342.96
  5. Step 5: Solve for x
    x = 800,342.96/999.88
  6. Step 6: Final answer
    x = 800.44

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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.