Home / 1,382.20-1,908.66-939.96

Finding the Fourth Proportional to 1,382.20, 1,908.66 and 939.96

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Solution

The fourth proportional to 1,382.20, 1,908.66 and 939.96 is: 1,297.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.20 : 1,908.66 = 939.96 : x
  2. Step 2: Convert to fraction form
    1,382.20/1,908.66 = 939.96/x
  3. Step 3: Cross multiply
    1,382.20x = 1,908.66 × 939.96
  4. Step 4: Simplify right side
    1,382.20x = 1,794,064.05
  5. Step 5: Solve for x
    x = 1,794,064.05/1,382.20
  6. Step 6: Final answer
    x = 1,297.98

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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.