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Finding the Fourth Proportional to 1,939.71, 2,672.28 and 1,349.22

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Solution

The fourth proportional to 1,939.71, 2,672.28 and 1,349.22 is: 1,858.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.71 : 2,672.28 = 1,349.22 : x
  2. Step 2: Convert to fraction form
    1,939.71/2,672.28 = 1,349.22/x
  3. Step 3: Cross multiply
    1,939.71x = 2,672.28 × 1,349.22
  4. Step 4: Simplify right side
    1,939.71x = 3,605,493.62
  5. Step 5: Solve for x
    x = 3,605,493.62/1,939.71
  6. Step 6: Final answer
    x = 1,858.78

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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.