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Finding the Fourth Proportional to 727.18, 1,003.21 and 443.45

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Solution

The fourth proportional to 727.18, 1,003.21 and 443.45 is: 611.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.18 : 1,003.21 = 443.45 : x
  2. Step 2: Convert to fraction form
    727.18/1,003.21 = 443.45/x
  3. Step 3: Cross multiply
    727.18x = 1,003.21 × 443.45
  4. Step 4: Simplify right side
    727.18x = 444,873.30
  5. Step 5: Solve for x
    x = 444,873.30/727.18
  6. Step 6: Final answer
    x = 611.78

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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.