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Finding the Fourth Proportional to 19,891.71, 27,451.29 and 10,939.90

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Solution

The fourth proportional to 19,891.71, 27,451.29 and 10,939.90 is: 15,097.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,891.71 : 27,451.29 = 10,939.90 : x
  2. Step 2: Convert to fraction form
    19,891.71/27,451.29 = 10,939.90/x
  3. Step 3: Cross multiply
    19,891.71x = 27,451.29 × 10,939.90
  4. Step 4: Simplify right side
    19,891.71x = 300,314,367.47
  5. Step 5: Solve for x
    x = 300,314,367.47/19,891.71
  6. Step 6: Final answer
    x = 15,097.46

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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.