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Finding the Fourth Proportional to 1,939.97, 2,921.36 and 1,395.97

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Solution

The fourth proportional to 1,939.97, 2,921.36 and 1,395.97 is: 2,102.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.97 : 2,921.36 = 1,395.97 : x
  2. Step 2: Convert to fraction form
    1,939.97/2,921.36 = 1,395.97/x
  3. Step 3: Cross multiply
    1,939.97x = 2,921.36 × 1,395.97
  4. Step 4: Simplify right side
    1,939.97x = 4,078,116.64
  5. Step 5: Solve for x
    x = 4,078,116.64/1,939.97
  6. Step 6: Final answer
    x = 2,102.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.