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Finding the Fourth Proportional to 999.39, 1,379.45 and 579.93

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Solution

The fourth proportional to 999.39, 1,379.45 and 579.93 is: 800.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.39 : 1,379.45 = 579.93 : x
  2. Step 2: Convert to fraction form
    999.39/1,379.45 = 579.93/x
  3. Step 3: Cross multiply
    999.39x = 1,379.45 × 579.93
  4. Step 4: Simplify right side
    999.39x = 799,981.54
  5. Step 5: Solve for x
    x = 799,981.54/999.39
  6. Step 6: Final answer
    x = 800.47

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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.