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Finding the Fourth Proportional to 1,251.98, 1,727.31 and 727.58

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Solution

The fourth proportional to 1,251.98, 1,727.31 and 727.58 is: 1,003.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.98 : 1,727.31 = 727.58 : x
  2. Step 2: Convert to fraction form
    1,251.98/1,727.31 = 727.58/x
  3. Step 3: Cross multiply
    1,251.98x = 1,727.31 × 727.58
  4. Step 4: Simplify right side
    1,251.98x = 1,256,756.21
  5. Step 5: Solve for x
    x = 1,256,756.21/1,251.98
  6. Step 6: Final answer
    x = 1,003.81

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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.