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Finding the Fourth Proportional to 725.63, 1,087.38 and 360.05

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Solution

The fourth proportional to 725.63, 1,087.38 and 360.05 is: 539.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.63 : 1,087.38 = 360.05 : x
  2. Step 2: Convert to fraction form
    725.63/1,087.38 = 360.05/x
  3. Step 3: Cross multiply
    725.63x = 1,087.38 × 360.05
  4. Step 4: Simplify right side
    725.63x = 391,505.73
  5. Step 5: Solve for x
    x = 391,505.73/725.63
  6. Step 6: Final answer
    x = 539.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.