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Finding the Fourth Proportional to 728.89, 1,091.56 and 481.94

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Solution

The fourth proportional to 728.89, 1,091.56 and 481.94 is: 721.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.89 : 1,091.56 = 481.94 : x
  2. Step 2: Convert to fraction form
    728.89/1,091.56 = 481.94/x
  3. Step 3: Cross multiply
    728.89x = 1,091.56 × 481.94
  4. Step 4: Simplify right side
    728.89x = 526,066.43
  5. Step 5: Solve for x
    x = 526,066.43/728.89
  6. Step 6: Final answer
    x = 721.74

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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.