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Finding the Fourth Proportional to 728.06, 1,091.07 and 481.55

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Solution

The fourth proportional to 728.06, 1,091.07 and 481.55 is: 721.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.06 : 1,091.07 = 481.55 : x
  2. Step 2: Convert to fraction form
    728.06/1,091.07 = 481.55/x
  3. Step 3: Cross multiply
    728.06x = 1,091.07 × 481.55
  4. Step 4: Simplify right side
    728.06x = 525,399.30
  5. Step 5: Solve for x
    x = 525,399.30/728.06
  6. Step 6: Final answer
    x = 721.65

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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.