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Finding the Fourth Proportional to 1,188.97, 1,639.60 and 939.79

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Solution

The fourth proportional to 1,188.97, 1,639.60 and 939.79 is: 1,295.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.97 : 1,639.60 = 939.79 : x
  2. Step 2: Convert to fraction form
    1,188.97/1,639.60 = 939.79/x
  3. Step 3: Cross multiply
    1,188.97x = 1,639.60 × 939.79
  4. Step 4: Simplify right side
    1,188.97x = 1,540,879.68
  5. Step 5: Solve for x
    x = 1,540,879.68/1,188.97
  6. Step 6: Final answer
    x = 1,295.98

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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.