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Finding the Fourth Proportional to 727.56, 1,089.90 and 605.43

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Solution

The fourth proportional to 727.56, 1,089.90 and 605.43 is: 906.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.56 : 1,089.90 = 605.43 : x
  2. Step 2: Convert to fraction form
    727.56/1,089.90 = 605.43/x
  3. Step 3: Cross multiply
    727.56x = 1,089.90 × 605.43
  4. Step 4: Simplify right side
    727.56x = 659,858.16
  5. Step 5: Solve for x
    x = 659,858.16/727.56
  6. Step 6: Final answer
    x = 906.95

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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.