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Finding the Fourth Proportional to 999.69, 1,379.55 and 580.05

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Solution

The fourth proportional to 999.69, 1,379.55 and 580.05 is: 800.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.69 : 1,379.55 = 580.05 : x
  2. Step 2: Convert to fraction form
    999.69/1,379.55 = 580.05/x
  3. Step 3: Cross multiply
    999.69x = 1,379.55 × 580.05
  4. Step 4: Simplify right side
    999.69x = 800,207.98
  5. Step 5: Solve for x
    x = 800,207.98/999.69
  6. Step 6: Final answer
    x = 800.46

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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.