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Finding the Fourth Proportional to 999.43, 1,379.49 and 579.95

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Solution

The fourth proportional to 999.43, 1,379.49 and 579.95 is: 800.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.43 : 1,379.49 = 579.95 : x
  2. Step 2: Convert to fraction form
    999.43/1,379.49 = 579.95/x
  3. Step 3: Cross multiply
    999.43x = 1,379.49 × 579.95
  4. Step 4: Simplify right side
    999.43x = 800,035.23
  5. Step 5: Solve for x
    x = 800,035.23/999.43
  6. Step 6: Final answer
    x = 800.49

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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.