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Finding the Fourth Proportional to 1,249.71, 1,724.48 and 725.61

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Solution

The fourth proportional to 1,249.71, 1,724.48 and 725.61 is: 1,001.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.71 : 1,724.48 = 725.61 : x
  2. Step 2: Convert to fraction form
    1,249.71/1,724.48 = 725.61/x
  3. Step 3: Cross multiply
    1,249.71x = 1,724.48 × 725.61
  4. Step 4: Simplify right side
    1,249.71x = 1,251,296.30
  5. Step 5: Solve for x
    x = 1,251,296.30/1,249.71
  6. Step 6: Final answer
    x = 1,001.27

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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.