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Finding the Fourth Proportional to 744.88, 1,025.87 and 728.73

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Solution

The fourth proportional to 744.88, 1,025.87 and 728.73 is: 1,003.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.88 : 1,025.87 = 728.73 : x
  2. Step 2: Convert to fraction form
    744.88/1,025.87 = 728.73/x
  3. Step 3: Cross multiply
    744.88x = 1,025.87 × 728.73
  4. Step 4: Simplify right side
    744.88x = 747,582.93
  5. Step 5: Solve for x
    x = 747,582.93/744.88
  6. Step 6: Final answer
    x = 1,003.62

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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.