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Finding the Fourth Proportional to 999.81, 1,379.49 and 751.73

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Solution

The fourth proportional to 999.81, 1,379.49 and 751.73 is: 1,037.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.81 : 1,379.49 = 751.73 : x
  2. Step 2: Convert to fraction form
    999.81/1,379.49 = 751.73/x
  3. Step 3: Cross multiply
    999.81x = 1,379.49 × 751.73
  4. Step 4: Simplify right side
    999.81x = 1,036,997.12
  5. Step 5: Solve for x
    x = 1,036,997.12/999.81
  6. Step 6: Final answer
    x = 1,037.19

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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.