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Finding the Fourth Proportional to 725.94, 1,087.02 and 663.48

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Solution

The fourth proportional to 725.94, 1,087.02 and 663.48 is: 993.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.94 : 1,087.02 = 663.48 : x
  2. Step 2: Convert to fraction form
    725.94/1,087.02 = 663.48/x
  3. Step 3: Cross multiply
    725.94x = 1,087.02 × 663.48
  4. Step 4: Simplify right side
    725.94x = 721,216.03
  5. Step 5: Solve for x
    x = 721,216.03/725.94
  6. Step 6: Final answer
    x = 993.49

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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.