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Finding the Fourth Proportional to 1,299.09, 1,792.79 and 739.61

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Solution

The fourth proportional to 1,299.09, 1,792.79 and 739.61 is: 1,020.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.09 : 1,792.79 = 739.61 : x
  2. Step 2: Convert to fraction form
    1,299.09/1,792.79 = 739.61/x
  3. Step 3: Cross multiply
    1,299.09x = 1,792.79 × 739.61
  4. Step 4: Simplify right side
    1,299.09x = 1,325,965.41
  5. Step 5: Solve for x
    x = 1,325,965.41/1,299.09
  6. Step 6: Final answer
    x = 1,020.69

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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.