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Finding the Fourth Proportional to 999.97, 1,379.62 and 606.85

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Solution

The fourth proportional to 999.97, 1,379.62 and 606.85 is: 837.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.97 : 1,379.62 = 606.85 : x
  2. Step 2: Convert to fraction form
    999.97/1,379.62 = 606.85/x
  3. Step 3: Cross multiply
    999.97x = 1,379.62 × 606.85
  4. Step 4: Simplify right side
    999.97x = 837,222.40
  5. Step 5: Solve for x
    x = 837,222.40/999.97
  6. Step 6: Final answer
    x = 837.25

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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.