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Finding the Fourth Proportional to 1,286.31, 1,775.31 and 727.02

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Solution

The fourth proportional to 1,286.31, 1,775.31 and 727.02 is: 1,003.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.31 : 1,775.31 = 727.02 : x
  2. Step 2: Convert to fraction form
    1,286.31/1,775.31 = 727.02/x
  3. Step 3: Cross multiply
    1,286.31x = 1,775.31 × 727.02
  4. Step 4: Simplify right side
    1,286.31x = 1,290,685.88
  5. Step 5: Solve for x
    x = 1,290,685.88/1,286.31
  6. Step 6: Final answer
    x = 1,003.40

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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.