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Finding the Fourth Proportional to 725.22, 1,091.89 and 639.09

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Solution

The fourth proportional to 725.22, 1,091.89 and 639.09 is: 962.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.22 : 1,091.89 = 639.09 : x
  2. Step 2: Convert to fraction form
    725.22/1,091.89 = 639.09/x
  3. Step 3: Cross multiply
    725.22x = 1,091.89 × 639.09
  4. Step 4: Simplify right side
    725.22x = 697,810.52
  5. Step 5: Solve for x
    x = 697,810.52/725.22
  6. Step 6: Final answer
    x = 962.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.