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Finding the Fourth Proportional to 999.69, 1,379.06 and 627.09

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Solution

The fourth proportional to 999.69, 1,379.06 and 627.09 is: 865.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.69 : 1,379.06 = 627.09 : x
  2. Step 2: Convert to fraction form
    999.69/1,379.06 = 627.09/x
  3. Step 3: Cross multiply
    999.69x = 1,379.06 × 627.09
  4. Step 4: Simplify right side
    999.69x = 864,791.60
  5. Step 5: Solve for x
    x = 864,791.60/999.69
  6. Step 6: Final answer
    x = 865.06

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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.